That sounds about right. If it's tuned up right you should be able to reach 220 miles before you need to fill er up. My truck has the same motor and reads full till around 50 miles, after 150 it drops pretty quickly. I usually fill up at 200 because the gauge reads empty but I still have 4 gallons left.Holds 17, I rarely get more than 13 in there. May need to put the jerry can in back and see how far it will really go before it actually goes dry.