12-13 - bad,but 17-20 sounds very good.I dont know what gear ratio and tire size,looks like regular size,and its automatic transmission.
You have to consider that mine needs a set of injectors and weighs close to
9K lbs. On the highway, I can get about 15 if I can keep it at 60 mph. I have been putting off changing the injectors, figuring that they will last until an engine swap. I don't drive it much right now, so the fuel mileage doesn't bother me.
I get 12-13, but I got a 4.10 rear end and C6 auto, so no OD. I'm not quite as heavy as some, but with my homemade bumpers, and aerodynamics worse than a brick due to my homemade frontbumper, I'm pretty impressed, especially when I say show me a 460 in my same set up that can break 10 mpg.
Hi GANG!! mines getting 19-20 empty if i keep her around 70MPH and that was checked going up and down Cajon pass out here to work I guess if i was running more flat ground it would be up around 20-22 i guess . but i have 4.10,C6, gearvendors OD,ats turbo. and whats a prius?? is that a wheel chock,? have a safe one everybody... glad to be part of the group!!!!
terry the IDIot
Well yes, that ATS will help you out big time, especially going uphill.
My truck, 7.3 n/a, dually, 4.10s, E4OD, pump turned up and advanced a bit, it gets 18mpg at 2000 rpms (60 mph) now, used to pull 20 in the summer on long trips. I do a lot of engine braking tho, and I don't let the cruise drive for me unless the road is nice and level. Under similar conditions your F250 should do about the same, if not better cause of the SRW setup and the better aerodynamics.
Geez I never do nearly as good as you guys...I've been getting 13 mpg around town...although on #2 diesel this winter I haven't been doing much better than 11 around town. Of course, my stupid intermittently dragging brakes have probably been hurting those numbers too.