2002 1500 qcsb. 4.7 liter, 142,xxx miles. Average is 15.

 

Currently 8.6 since it turned cold and thats driving to work only. 7 mile trip thats all stop and go. Was around 10.5-11.5mpg when it was warm out. Doesn't help I still have 3.55 gears turning a 315/70-17. My car when it still saw daily driver use got horrible milage also when used to goto work.

Quick long trip today saw 14.3 when not having to deal with lots of stopand go.

 

Several months ago I discovered (on my 2002 4.7) that the transmission temp sensor was open, causing the trans computer to go waaay down the road before it would shift into OD. Sometimes going 5 or 6 miles down the highway before deciding it was time. So I put a 2K ohm resistor into the circuit to simulate the transmission's normal operating temperature. The trans computer won't allow the trans to shift into OD until the water temp reaches 120 degrees, which happens in a mile or so when it's really cold outside. That GREATLY improved my cold weather mpgs and hasn't affected transmission performance in any way. With the 120 degree shift control, the trans is still protected and warmed up before it's time to go into OD.

Another mod I did at the same time was to put a potentiometer in the Intake Air Temperature sensor circuit so I can control the temp reading to the engine computer. I found that in warm weather I got better mpg's when the intake air temp was around 125 degrees (using the factory IAT sensor). The mpg's would go down when it got colder outside since intake air temp follows outside temp, typically running 30 degrees or so higher. Using a Scangage that monitors IAT and water temps, I start out with IAT set the same as water temp, and raise the IAT with the water temp until I max out at 125. Now I tell the truck it's summertime all the time, giving me 18-20 mpg's on the highway year-round without change in performance in any way.

 

05 Ram quad cab, 5.7L, 3:92 gears. 142,000km. flowmaster cat back duel exhaust. 8.5mpg city

 

2007 reg cab 4x4 sport 5.7 few small mods cai exhaust chip cai vent scoop

winter i get 14-15 mpg thats alot of letting truck warmup in nast candadian winters
summer 20-22 mpg depending what type of highways and how heavy my foot is

 

Just made a trip to the Mecum Auto Auction last week. The drive down was in heavy rain, fog, mist, etc., etc. Had to drive closer to the speed limit than I like. Best mileage I've gotten in the Ram ever - 16.1 mpg.

 

That is something I have noticed. If you drive 60-65, the truck gets fantastic (comparatively) mileage. The only downside it that it's only, on average, +1MPG in mine. Sorry, but when it's happy and want's to do 80, I usually have somewhere to be as well.... Guess that it doesn't help that I ALWAYS have somewhere to be when I'm driving.

 

My 2002 pulls a camper trailer, 5.9L engine. Mileage in the single digits. I think it's time for an upgrade!

 

1500 Hemi Megacab:

Was 11/17 ave 13 best 19 on 265/70's
Now 9.5/17 ave 11 adjusted on 295/70's

 

2006 4x4 Mega Cab 5.9
last highway trip 18.2 mpg at about 70 mph using the cruise control