Join Date: Nov 2015
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Miles til empty: My 2015 5.7L will display 325-340 miles to empty on a full tank during the summer. That number can drop to 290 in the winter. I figured it was gasoline formulation changes between summer and winter. However, the number shown usually tracks pretty close to how far I go between fill ups. For example, if I fill up and get a "Miles to empty" reading of 320 miles, I can reset my trip odometer and will be getting fuel in about 320 miles.
My fuel gauge runs to empty as the miles to empty approaches 0.
My fill-up is about 19.5 to 20 gallons when my "mile to empty" reading drops below 10 miles remaining. I don't count the 6.5 to 7 gallon "reserve" that remains.
As for mileage difference between 60mph and 70 mph...my first gen Tundra (with 4.7L) was very sensitive to speed increases. I usually could get about 16.5 mpg at a steady 60 mph; I once got 20 mpg under perfect conditions going cross-country with the cruise set at 60. At 70, that mileage usually dropped to mid-15's and below 15 at 75. My 2015 5.7L is somewhat less sensitive, but I can still see a drop of about 0.7 mpg between 60 and 70.
21.3 cents per mile seems pretty chintzy for mileage if you're using your private vehicle to conduct company business. Even if you had an economy car, I'm not sure 21.3 cents would cover your total cost of operating the vehicle on a per mile basis (fuel, maintenance, insurance, depreciation, taxes and tags........)
2015 Double Cab SR5 TRD Off Road
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