I do mostly hwy driving, get 17+ in warmer weather and 15 in winter (my foot is also kinda heavy cuz I like the sound). I have a 2003 4.7 QC w/170,000 miles. You may need to change plugs, 02 sensor and then check your mileage again. Seems low to me too.

 

i was just stating an average i never said 16 for city

 

usally i see 300miles when my gas light comes on. but i do have the 24 gal tank. i can stretch it out to 400 miles if i feel lucky.

 

I really don't know how these guys are getting over 15-17 mpg.I have just tuned my 2003 Quadcab 4x4 automatic with 3.55 gears and a set of Cooper P275/70/16 Discovery H/T tires,I have not done any type of modding,still has factory air cleaner,factory Cat.On the open road running 70 mph,the engine turning around 1900 rpm,the overhead display says 15.9-16.2.Now intown I average 12-13 and that is on a good day.My truck has 122000 miles and has never been off-road,mudding,or abused.I would LOVE to fine out how to get 17-19 mpg. The main question is why is anyone worried about fuel mileage,if you buy a truck you do not buy it for fuel mileage gas or diesel. I have heard of people with the newer model Diesels quoting they can get over 21mpg and that is hard to believe.But like I have said you buy a truck to haul,do work out of,or as a daily driver,they just don't get gas mileage

 

actually not true at all diesels get outstanding gas mileage for the size of the trucks they are in and they amount of power they have. i know this from firsthand experience. i have numerous friends with diesel trucks that i work with. one has a 2003 ram 2500 long bed cummins and gets 19-20 mpg city and like 25 on the highway and it is bone stock. my other friend used to have an 04 f250 long bed leveled on 35s with intake exhaust and chip and it got 28 mpg at 80 mph, thats hand calculated. diesels get outstanding gas mileage compared to gas motors and its not only like 2010 models

 

Diesels truely are awesome my uncle has a 03 f250 7.3 powerstroke and he gets 18 around town and highway is 24. When he tows his camper he gets the same mpg I get in my truck, now thats sad. I so wish I had one, maybe this fall.

 

yea i want one so bad too they have a **** load of power and get way better mileage, and chipping them does alot more than tuning a gas motor, and i love pouring smoke, what else could you need?

 

Going home last weekend I got 20.8...pretty sure they switched to summer gas though. This is even with my 32" MT's ect. If my truck gets under 17.5 i'm usually upset. I guess the 5 speed and 3.92 rear really does help compared to the shorter gears and an auto. I towed an empty 6x12 back up on Sunday about 150 miles basically all HW with my Superchips on Towing mode and only got 14.1...if i got that everyday though I'd probably have a different vehicle. I dont understand how MPG can vary so much between these trucks sometimes..

 

Are there chips out there that might help improve Fuel Economy? Really I do know it is a truck but it is not a large truck. I know guys with 4dr F150 4wd getting better fuel.

Just weird that the size of this truck and the fuel economy don't add up.

Maybe just the way it is programmed?

 

If you have a 5.2 mpg wont be that great. They are old motor with old technology but are very reliable and have a pretty good market for aftermarket parts so I dont care.