I am getting 14.2-14.5 now after I added the FASS and driving normal (for me)....With this tank I just started keeping the rpm's at or below 2,000 and keeping my foot out of it in town. This puts me at about 67.5-68 mph according to my gps (speedo showes 65). I will let you know what I average once I get a few tanks in it.

Well it has been a long time since I've visited and I'm updating all my post I said I would. I am still getting about the same mpg. A little better with the FASS but not near what others are saying (with about the same setup). I am working on my steering issues and wonder if this could cause me to be loosing some mpg. I sure hope so. After that I'm lookaing at the Adrenalin.

Just filled my 01 yesterday. Had 577 miles on the previous tank and put in 29.7 gallons. Come to just over 19mpg.

once you get the fueling taken care of look into the dynatrac freespin kit for hubs. i got another 2.5mpg out of them.

Have a truck at my shop with the same problem. He says it's been going down steadily for a few months now and is at 13ish MPG now. I know of other trucks with the same config that get near or just over 20. This guy says the VP44 and bosch 275 injectors are only about a year old. No codes, no smoke of any kind. Truck actually runs down the road great - real responsive and plenty of power. Going to check the fuel pressure and overflow today. I see lots of these threads all over, but no one seems to be able to solve the problem. Very strange.

i cant help but wonder with 140k on mine if replacing the maf sensor would show a gain

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has anyone ever removed the AC cooler from infront of the intercooler and remote located it with its own fan? i cant help but wonder how much more power and how much more efficient it could be without that infront of my intercooler.has to make for more power and mileage but is it a noticable amount?