14-15 MPG's

I have tested the highest octane fuel we have here in Alaska which is basically 90. With 90 octane fuel I was getting worst mpg, averaging about 18-19 hwy. Switch back to 87 octane and was getting 20-21mpg hwy. Don't get me wrong, I have always use premiums on all my vehicles but for some reason my Tacoma does better with the regular gas. This is all Chevron fuel by the way.

I drive 32 miles to work and 32miles home everyday so I keep an eye on my fuel expenses quite closely.

 

5600 miles on mine, hand calculated average 20.6 MPG. About a 50/50 mix of city/hwy.

 

Is all the gas in Alaska ethanol-free?

 

My '14 V6 DCLB 4x4 with a tonneau: 15 if I'm careless and 17 if I'm obsessed with it. Just put a shell on, looks like my mpg difference is negligible.