Ford

So you need to figure out what that would have cost you in the Trailblazer SS.

For our first year of the EV9, my wife put on 16,871 miles. Average cost for public charging in the greater Seattle area is 25 cents per kW. Across the state we see rates run from 20 cents to 60 cents in the most remote places. Home charging is 10 cents per kW. 1yr total electrical cost is $632 and this includes 4 public charges for road trips. So my cost per mile unless I did my math wrong is 3.7 cents per mile. No oil changes, no other maintenance.    

Absolutely, but I'm talking about like verse like. You're sorta in the same situation I am in. I have a nearly paid off Avalanche with only 63k miles on it, so buying a Silverado EV to save on gas doesn't math. It sounds like you're not putting a lot of miles on it then, which is also valid.  Differing driving habits change the math. @G. David Felt sounds like he's on the road a lot. My mileage usage varies significantly each month so its difficult to make the case for an EV unless I bought one solely to put business miles on and save the Avalanche for personal driving. For April, I claimed over $1600 in mileage. May will probably be around $400. As I said... it depends. In this image, the chart is set to 15,000 miles a year, $3.50/g for gas, and 25c/kW for electricity.

There's also the massive price difference between a brand new EV9 and a 2017 Navigator, probably about $50,000. That's A LOT of miles to cover that gap. This tank that cost $68 to fill from 1/4 tank was last filled up on 4/5. I went a month and $30.75 is way more than I go through in a week, because I don't drive 300 miles in a week. 

Eh, as with all things, it depends. If you live in an apartment and your goal is simply the lowest cost per mile, buy a Pruis and we'll see you again in 250k miles. But comparing the most popular EV sedans today to a Pruis isn't really a fair comparison. The EVs have more features, tech, and performance. A Model-3 or Ioniq 6 will vastly out perform a Pruis, and the Ioniq 6, especially after the update, has a nicer interior and more compliant ride. Both of those EVs are more comparable in performance to something like an Acura TLX 3.0 Turbo or BMW M340i, both of which prefer premium. Now, if you're in an area with few chargers, then you'll need to do research.  In my area, there are lots of chargers and they all have different rates, often at different times of the day.  One advantage that charger operators have is that they can vary their rates based on time of day.  So if everything in my life were the same except I was living in an apartment instead of a house, I would look at which chargers had the lowest rates.  The slow-ish 6KW chargers across from the office I'm in today are 11/c/kWh right now.  That's cheaper than I can get at home.  A lot of the mid-speed chargers around me are 25/c/kWh, still quite reasonable and would make a Model-3 about the same cost per mile as a Pruis. The other thing to consider is vehicle size.  Because of the non-liner way we calculate fuel economy in this country, bigger gas vehicles do worse than their numbers seem. A Tesla Model-3 will cost between 8c and 13c per mile to fuel at normal Supercharger rates. Fuel Cost $3.50   MPG Cost Per Mile Cost per 100 miles 15 $0.23 $23.33 20 $0.18 $17.50 25 $0.14 $14.00 30 $0.12 $11.67 35 $0.10 $10.00 40 $0.09 $8.75 45 $0.08 $7.78 You can see why I picked the Pruis as the comparison model. At 45 mpg, it's the only vehicle that comes close to the cost per mile of a Tesla at cheap supercharging. Now, comparing your Navigator to David's EV9, the savings start to stack up. The EV9 does 99 MPGe City and 88 MPGe highway, burning on average 46kw per 100 miles. Even at 60c/kw charging which is the most expensive I can find in my area, David is looking at $24.60 to go 100 miles, basically the same you and I would pay to fill our trucks.  But David can almost certainly find cheaper charging than that. If he charged at the building across from where I am today for 11c/kw, he'd pay $4.51/100 miles.  At a more common 25c/kW, he'd pay $10.25/100 miles. If he charges at the 25c place and commutes 300 miles a week, he's looking at $30.75 a week. You in your Navigator and me in my Avalanche aren't getting anywhere for $30.75 a week. The efficiency king (in affordable EVs) right now by a long way is the Ioniq 6 with 135 MPGe, large battery, and some of the fastest charging. Except for the Lexus RZ which has a low range, all the rest of the top MPGe players are around 115MPGe or less.