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Best Fuel for new 4.6 L Northstar V-8 engine

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I just bought a Buick Lucerne that has a 4.6L Northstar V-8 and I was wondering what grade of fuel would be best for it. This is to seek maximum fuel economy, performance and engine life. I want to keep this vehicle for several years so I want to use fuel that will help with overall longevity.

Also, what engine oil would be best for long term operation and economy.

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The northstar runs on regular, but you get more power out of premium. For everyday driving, regular is fine.

For oil, use Mobil 1. I think these are still 8 quart engines, so an oil change can get costly.

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