Miles per gallon- What are you getting?
Amateur
Joined: Jun 2010
Posts: 27
Likes: 0
From: Pittsburgh, PA
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.
Quick long trip today saw 14.3 when not having to deal with lots of stopand go.
Amateur
Joined: Jan 2010
Posts: 44
Likes: 0
From: Coffee County, Tennessee
MPG mods
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.
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.
Professional
Joined: Apr 2010
Posts: 226
Likes: 0
From: alberta canada
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
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
Champion
Joined: Aug 2007
Posts: 4,702
Likes: 2
From: N. Florida
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.
Rookie
Joined: Aug 2009
Posts: 97
Likes: 0
From: Dallas TX
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.
