I've only ran one tank and that was 381.4 miles and it took 20.9 gal to fill it up. 18.2mpg for very first tank i'm pleased with that! I checked what miles it was when gas light came on and by calculations it was 19.7gal used. These trucks have a 26 gal tank with a 6 gal reserve.
Range is nice, but in the end you have to go by actual mpg. Use the same fuel pump (to eliminate the variable of when the auto-shutoff occurs), and do at least three tanks of gas, driving as you normally would. Record how much you put in each time, and how far you went, and then determine actual mpg. I keep a logbook in each of my vehicles for this sort of thing.
I've only filled up twice, about 320 to the fuel light. Was sad to see 16.8 on the first; was excited to see 17.9 on the second--until I got in and realized it clicked off at 7/8 full. Doah! I only drive it on weekends so it's going to be another month before I figure out if it has issues, or even figure out exactly what is doing.
My odo is currently at 2500 miles. Most times I drive like a teenager and around town with an average 10 mile trips a day I've gone from a solid 10 miles a gallon to almost 12. With 50% highway I've gotten as much as 14 miles a gallon.
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