Gas tank mileage

Stock SR5. I wouldn't say 90+ MPH as conservative.

 

That's excellent mileage for that type of speed even with it being mainly flat terrain

 

100% accurate. Well, I managed high 13's and just barely hit 14 when I got to the gas station after the miles to empty hit zero a few exits back. Said 25 miles to empty when the light came on and I only drove maybe 8 miles and it was at zero. That's I-70 driving from Colorado to Kansas then down I-135 to Wichita. One full tank full from the gas station to empty at the next. Drove 75-78 or so most of the way, fairly flat too. Just stuck in 4th gear the whole darn time. Meanwhile my 2002 Camaro SS with a 5.7L LS1 and a 4 speed auto gets low 20's doing the same thing (very good aero on that car though). Shame it's not my daily (most of the time)

 

I think it’s a combination of averaging 75ish on the highway, living at 5000ft in a mountainous area, and BFG KO2s.

 

I just drove that stretch of 70. It's flat going east, and losing elevation ever so slightly for a very long time.

My best tank is 27mpg, and couldn't manage to get over 17 from just outside of Denver to Salina(edit: I think it was Hays, actually). The wind is brutal out there.

 

Then something seems wrong. I was averaging ~19-21mpg going 80 in extremely high altitude with a passenger and a truck full of luggage last week on trip I was on.

Bottom line, you should not be getting 10mpg on the freeway.

 

I think it is the draft from my spare tire.