Discussion Starter · #1 ·
I bought my truck 8/31/15. 2013 F250 King Ranch 4x4 with 55k miles on it. The previous owner used it to tow a fiver and a pontoon boat. I picked it up and drove it home on a 2 lane country highway averaging 62 mph and 17.8 mpg. I finished that tank and 2 others and got between 14 and 17 depending on road/traffic. This is using the on-board calculator between fill-ups and my calculator at the pump. I towed my 35' travel trailer about 200 miles, and got 9.6 mpg doing it. Since then, I've consistently averaged 11.7 mpg in the same mixed driving I got 14-17 on 1.5 months ago. Short of disconnecting the batteries and letting the ECM reset, is there anything I can do to fix this abysmal fuel economy? I've been driving like a codger, coasting as much as possible, avoiding stop lights and busy intersections as possible, and still not getting anything better.