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knightfan26917

Fuel Economy

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Fuel economy is a buzz phrase that most car buyers/owners want to maximize. Accordingly, car manufacturers are striving to give buyers excellent MPG.

Among newer Ch#$r%*ets, while not the most fuel-efficient models available, these are still considered by many to be "fuel efficient" (compared to say, trucks, SUVs, etc.), with figures I searched for online...:

2008 V6 malibu, FWD ... EPA-estimated 17 mpg city

2008 V8 (active fuel management) impala SS, FWD ... EPA-estimated 16 mpg city

2007 V8 (active fuel management) mc SS, FWD ... EPA-estimated 18 mpg city

Comparing ... the 2008 V8 G8 GT, RWD, has an EPA-estimated 15 mpg city

Meanwhile, the 2008 Dodge Charger V8, RWD, has an EPA-estimated 17 mpg city

...and the 2008 Dodge Charger 3.5 V6, RWD, has an EPA-estimated 19 mpg city

Highway EPA-estimated MPGs are touted the most, but for this comparison, I'm using the city EPA estimates, since my RWD Monte Carlos are used more or less in the city.

I've NEVER claimed my Monte Carlos to be fuel efficient..and I still do NOT claim that; however, comparing my real-world MPGs to EPA estimated MPGs for newer engines...imho, a few of them certainly are NOT the gas guzzlers most people see them as.... Course, options on the cars along with the type of V8/V6 engines are factors that I have not taken into account...which might be unfair.... Even so, the comparisons are intriguing to me...and, with no car payments (versus a car payment with a newer car) and lower insurance premiums for the older cars (vs higher insurance premiums for a newer car), I'll stick with my older cars...for now, anyway....

1972 MC, 350 V8

... 1st 2008 fill-up, June 1 ... 15.18 MPG

... 2nd 2008 fill-up, July 4, after ~142 miles, 10.215 gallons .... 13.87 MPG

1976 MC, 305 V8

... 1st 2008 fill-up, June 1 ... 13.58 MPG

... 2nd 2008 fill-up, July 4, after ~137 miles, 10.095 gallons ... 13.58 MPG

1979 MC, 350 V8

... 1st 2008 fill-up, June 1 ... 15.47 MPG

... 2nd 2008 fill-up, July 4, after ~141 miles, 7.859 gallons ... 17.94 MPG

1981 MC, 3.8 V6

... 1st 2008 fill-up, June 1 ... 18.60 MPG

... 2nd 2008 fill-up, July 4, after ~139 miles, 7.086 gallons ... 19.62 MPG

1987 MC LS, 305 V8

... June 1 ... 19.26 MPG

... June 8 ... 17.10 MPG

... June 13 ... 18.40 MPG

... June 18 ... 16.43 MPG

... June 22 ... 18.78 MPG

... June 30 ... 19.03 MPG

... July 6, after ~155 miles, 8.118 gallons ... 19.18 MPG

Cort:34swm."Mr Monte Carlo.Mr Road Trip".pig valve&pacemaker

WRMNshowcase.legos.HO.models.MCs.RTs.CHD = http://www.chevyasylum.com/cort

"Who do you think you're talkin' to?" ... Lee Roy Parnell ... 'What Kind Of Fool Do You Think I Am?'

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curious about the transmission difference, if there is one from 72 to 79? alot had changed in the 15 years between your old and new.

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About 14 or 15 MPG is about right for cars of the Era and size.

Chris

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curious about the transmission difference, if there is one from 72 to 79? alot had changed in the 15 years between your old and new.

Oh my yes.

I don't know the specs offhand, so I'll have to get 'em for you later. The '72 has a 3-speed, but the previous owner told me it had been replaced, and she didn't know what was put in (a bit scary)...and, when I first got the car in 2002, I sifted through the paperwork she gave me...and none of it mentioned a new tranny...so, I don't know if I'll have the specific info on that one.....

Cort:34swm."Mr Monte Carlo.Mr Road Trip".pig valve&pacemaker

WRMNshowcase.legos.HO.models.MCs.RTs.CHD = http://www.chevyasylum.com/cort

"Do you see what I see?" ... One Republic ... 'Stop and Stare'

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Just filled up my mustang for the first time since I got it. 14 gallon (regular of course) fill up that took me 325.5 miles. thats 23.25 mpg. Not bad but it is about 80 percent highway and I baby a lot. Going for the smooth shifts and stuff still since I havent driven a stick since I was 16, almost 6 years ago. Only stalled once so far since I got it.

for those who don't know its a 05 GT so its the 4.6 v8 wit 5 speed stick and 3.55 rear end.

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That isn't too shabby, intrigued.

Any idea what the EPA rating on that is? It'd be interesting to see how well it is getting compared to the EPA estimate.....

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All three of our cars seem to beat the EPA estimate handily.

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Knightfan, I wonder why the '76 gets worse mileage than the '72? Even though the 305 is in the '76 instead of a 350. Though the 305 isnt as different in that respect from a 350 as people would like us to believe. For the record this is generally what mine get.

1985 Caprice with the 305 Chevrolet V8 and 4-speed auto. About 15 town and maybe 22-23 highway.

1981 Bonneville with the 307 Olds V8 and 4-speed auto. About 16 town and about 23-24 with an occasional 25 highway.

2005 Equinox with the 3.4 liter V6 5-speed auto. About 17 town and about 24 highway.

2007 Sears lawn tractor with the 18 hp Briggs and Stratton OHV. Havent tested that, but I will let you all know what it comes up with. :lol:

As you can see they all arent hugely different. The Bonneville has always been that little bit better in that respect than the Caprice though the Caprice scoots a little bit quicker too.

Edited by 2005 EquinoxLS
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The factory sticker is rated at 17/25. This was the old rating scale of course.

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Just filled up my mustang for the first time since I got it. 14 gallon (regular of course) fill up that took me 325.5 miles. thats 23.25 mpg. Not bad but it is about 80 percent highway and I baby a lot. Going for the smooth shifts and stuff still since I havent driven a stick since I was 16, almost 6 years ago. Only stalled once so far since I got it.

for those who don't know its a 05 GT so its the 4.6 v8 wit 5 speed stick and 3.55 rear end.

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Just filled up my mustang for the first time since I got it. 14 gallon (regular of course) fill up that took me 325.5 miles. thats 23.25 mpg. Not bad but it is about 80 percent highway and I baby a lot. Going for the smooth shifts and stuff still since I havent driven a stick since I was 16, almost 6 years ago. Only stalled once so far since I got it.

for those who don't know its a 05 GT so its the 4.6 v8 wit 5 speed stick and 3.55 rear end.

Actually that's a damned fine car!

Chris

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I'm averaging about 28 mpg in the Jetta and that's with maybe 40% highway driving and an admittedly heavy right foot. I'm thoroughly pleased, to say the least, considering what I was dealing with previously.

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30 Mpg w/ the wife's Cavalier-about 50 city/50 freeway....

only 25mpg with the Cobalt...but lately it has been all city, and it is due for a fuel filter, which should help.....

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I sold my Yukon (sniffff....snif....) and bought a super clean 99 s-10 for $2000 as an experiment for running around & work transportation...

The 2.2 liter had a funny noise like lower end bearings....I thought it was a bad idler pulley - it was. $35.

Aired up the tires to 35psi/cold air intake/new sparks w extra gap =29 mpg mission accomplished-love it.

IMG_2394.jpg

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Mianly drive the Prizm which gets 32-35 in mixed driving.

Intrepid does about 24 in mixed driving. Haven't been using it much lately, mainly because it needs a ball joint or tie-rod and I haven't gotten around to doing them yet...oh and it has no A/C so yeah.

Not sure about the GM, haven't calculated it yet, but we may take it on a trip to the western part of the state today, so that would be a good chance to calculate it.

Edited by Dodgefan
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>>"I wonder why the '76 gets worse mileage than the '72? Even though the 305 is in the '76 instead of a 350."<<

lower-powered 305 in the same size/ weight car has to work harder to perform the same as the 350.

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Well My caprice averages 17 with a heavy, heavy, heavy right foot. but if i head up north normally i set cruise at about 68 and average 25-26. Throttle body helps and the 200 4r trans is way more efficient than the 700r or TH350. I think the 76 needs a tuning. Or the driver needs to stop listening for the exhaust. Trust me balty the 305 doesn't need to stress much more than a 350 to pull around a car. it holds it own. 170 hp 260 ft lbs of torque.

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I think the 76 needs a tuning. Or the driver needs to stop listening for the exhaust.

LOL!

I WISH it were a case of me needing to stop listening for the exhaust ;).

But, no, the '76 always seems to "drag" a little bit upon cold starts. It's fine once it gets warmed up...but, it tends to bog and, sometimes, will hesitate/stall as I drive it out of the garage. And, yep, it has been tuned up....

Cort:34swm."Mr Monte Carlo.Mr Road Trip".pig valve&pacemaker

WRMNshowcase.legos.HO.models.MCs.RTs.CHD = http://www.chevyasylum.com/cort

"I ain't ready for the junkyard yet" ... George Jones ... 'I Don't Need Your Rocking Chair'

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The choke probably just needs adjusting Cort. Seemed like in those days they adjusted the choke to come off as quickly as possible. Problem is that if you go to far with that kind of thinking it makes the car want to stall while it is warming up. Also make sure your Thermac is working right. If the door in the tube leading to the air cleaner sticks open and doesnt close when its cold it will suck cold air while it is warming up causing it to stumble and also it wont warm up as fast causing poor fuel economy. Just a few things to think about. Another question not related to this, does the 305 in the '76 ping at all or is it pretty quiet. Thats was a horrible problem on the 1979 Impala I had with the 305 and also on Mom and Dads 1978 Impala with that motor. Not a problem on the 1985 Caprice since that has a knock sensor.

Capriceman, are you sure yours has a 200-4R? My 1985 has the 700-R4. Mine gets about 15-16 town and 23-24 highway. I should replace the spark plugs in it though before winter comes again. Mine is bone stock just as it came from GM in December of 1984. Did you get your all fixed from when it got stolen? I would like to replace the radio in mine with something modern but I hate to see that part of the dash get cut up. I understand that the climate control-radio are one piece. Am I right?

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yeah it has a 200 4r. they put them in in 1987 along with Throttle body Injection.

HPIM2224.jpg

Proof from the trans stick.

but right now the caprice is getting 0 MPG

HPIM2221.jpg

Spot anything wrong?

Needs one of these all Im waiting on is a sending unit comes in on friday

HPIM2222.jpg

but to solve your radio problem, heres what i did since the harness will stretch

HPIM2216.jpg

HPIM2217.jpg

Edited by capriceman
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Believe it or not, my Suburban got a hair over 18MPG on its last fillup in mixed driving. Not bad for a two-ton school bus with a TBI 350 and a 700R4 with a 3.42 rear end. I wanted a big block when I was originally looking but with the way gas prices went soon after, I'm glad I just got the 350.

I recently stumbled upon a diesel Burb and am seriously considering it. Anybody have any idea what they get?

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Capriceman ... I like your radio solution. I may have to do that myself ;).

The choke probably just needs adjusting Cort. Seemed like in those days they adjusted the choke to come off as quickly as possible. Problem is that if you go to far with that kind of thinking it makes the car want to stall while it is warming up. Also make sure your Thermac is working right. If the door in the tube leading to the air cleaner sticks open and doesnt close when its cold it will suck cold air while it is warming up causing it to stumble and also it wont warm up as fast causing poor fuel economy. Just a few things to think about. Another question not related to this, does the 305 in the '76 ping at all or is it pretty quiet. Thats was a horrible problem on the 1979 Impala I had with the 305 and also on Mom and Dads 1978 Impala with that motor. Not a problem on the 1985 Caprice since that has a knock sensor.

No...the '76 doesn't ping at all.

And, the choke has been adjusted...multiple times...lol. I'll check the other again, too, though I know that has been done.... Ya never know, though :).

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I wonder if Muntz in Appleton has ever did a stereo that way? I have Circuit City and they have always did me well but Muntz is more specialized in stuff like this. Might be better to let them do it. I dont have a lot in my glove box. I shall have to look at my trans dipstick but I was told mine has the 700-R4 when dad had it rebuilt. Mine also has the 4 barrel carburetor yet which works surrisingly VERY well. Havent had problems with the gas tank or sender yet. I needed a cycling switch for the A/C and the high speed blower relay on mine but that was it. Might see about new spark plugs before it gets cold again. I think now the Bonneville is going to need a high seed relay soon. Had to coax it to work on high. If ever the lower 3 fan speeds with but not high check that. Itsa $10-$12 part.

Edited by 2005 EquinoxLS
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UPDATING:

I filled all of the MCs up with gas Sunday, August 3...

72 MC "Browny"

...after ~164 miles ... 10.588 gallons ... 15.52 MPG

76 MC "Elvira"

...after ~160 miles ... 10.127 gallons ... 15.86 MPG

79 MC "Sweet Pea"

...after ~179 miles ... 9.502 gallons ... 18.89 MPG

81 MC "Sweet Tea"

...after ~162 miles ... 7.503 gallons ... 21.67 MPG

87 MC "Baby Blue"

...after ~163 miles ... 9.284 gallons ... 17.58 MPG

...previously:

...July 13 ... 18.13 MPG

...July 20 ... 19.36 MPG

...July 20 (after short trip in IL) ... 22.83 MPG

...July 27 ... 17.67 MPG

Cort:34swm."Mr Monte Carlo.Mr Road Trip".pig valve&pacemaker

WRMNshowcase.legos.HO.models.MCs.RTs.CHD = http://www.chevyasylum.com/cort

"I didn't mean to take away your dreams" ... Hootie & The Blowfish ... 'Only Lonely'

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Took a road trip this week and went 328 miles on 14 gallons in the stang. Equalls a little more than 23.4 mpg. Not bad at all. Would have done better exept there were a few big pockets of stop and go traffic and crappy road conditions.

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