HandOverFist
TJ Enthusiast
2005, 4.0, auto, 33" tires, 3.73 - Best I have seen thus far is 12mpg...hoping the replacement shift solenoid pack will restore my OD and increase the mpg figures.
@AndyG takes all contributions. Bitcoin works for him.
12-15 is pretty typical for a TJ with 33" tires, I wouldn't give that mpg a second thought.I curious about what axle ratio too.
I'm running a 4.0, 5 speed, 33" and get 12-15. I tend to average 12.5 city and highway driving, and I get 15 cruising the back roads in the 45-60 mph zone.
With your particular transmission 3.73 with 33" tires is causing your engine to lug on the highway which will cause really poor mpg. In the case of Jeeps running big tires, lower engine rpms does not equal better mpg. I regeared my TJ with 35's and the same automatic transmission you have from the 4.88 ratio it came from to 5.38 which raised the rpms enough to raise my mpg from sub-12 mpg to 14.6.2005, 4.0, auto, 33" tires, 3.73 - Best I have seen thus far is 12mpg...hoping the replacement shift solenoid pack will restore my OD and increase the mpg figures.
I regeared my TJ with 35's and the same automatic transmission you have from the 4.88 ratio it came from to 5.38 which raised the rpms enough to raise my mpg from sub-12 mpg to 14.6.
With your particular transmission 3.73 with 33" tires is causing your engine to lug on the highway which will cause really poor mpg. In the case of Jeeps running big tires, lower engine rpms does not equal better mpg. I regeared my TJ with 35's and the same automatic transmission you have from the 4.88 ratio it came from to 5.38 which raised the rpms enough to raise my mpg from sub-12 mpg to 14.6.
12.24 lifetime averag of all driving including pulling trailers.
On Hwy drop below 60 and mine goes up to the 17 range.
6-speed, 4.56, 35’s
Neither of those rpms will give good mpg, I really/strongly doubt replacing the solenoid pack will affect it in the least.Mine has been turning 3400rpm + @ 50mph when it registered that 12mpg. With the OD engaged rpm's dropped to 1400 at the same speed. I believe the solenoid pack will net better shifting overall and bring those mpg figures up...crossed fingers.
Neither of those rpms will give good mpg, I really/strongly doubt replacing the solenoid pack will affect it in the least.
Unfortunately my TJ has less than ten miles on it since moving here to Florida. We've been too busy since the move for me to drive it much. Not to mention it has been raining often enough that I need to install that new top that's still boxed up in the garage. All that's on it right now is my dusty safari top. We might even see some high winds and heavy rains from that hurricane that's about to hit Florida. We're not supposed to get hit with the main storm but we're definitely going to see some of its outer effects.Did moving to a flat state help any with the mpg? I would think lack of mountains would help.
Unfortunately my TJ has less than ten miles on it since moving here to Florida. We've been too busy since the move for me to drive it much. Not to mention it has been raining often enough that I need to install that new top that's still boxed up in the garage. All that's on it right now is my dusty safari top. We might even see some high winds and heavy rains from that hurricane that's about to hit Florida. We're not supposed to get hit with the main storm but we're definitely going to see some of its outer effects.
I think you guys are forgetting that jeeps are smiles per gallon, not miles per gallon!
TMI, the last thing I worry about on my TJ is its mpg.Maybe someone wants to geek-out on this.
I’ve tracked mpg using Fuelly
View attachment 362210
View attachment 362211
View attachment 362212The drop in mpg around the new year is from an experiment I did shifting at and driving at very low rpm. To @Jerry Bransford point. Ironically this coincided with the rise in gas prices. Not a great formula…higher price per gallon and lower miles per gallon.
Around the spring I started shifting and driving at higher rpm. Typically 2750 to 3000 with occasional shifts as high as 3300. Average mpg increased. Is only a mile or two per gallon change but it increased none the less.
4.0, 5 speed, 33’s at 26 psi, 3.73's