- Sep 4, 2020
Hey all. I upgraded the Jeep and went from 30/35 axels to a 30hp/44. I installed lockers and got a re-gear from a reputable shop. Before the re-gear the engine lugged all the time. I basically just ran it as a 3 speed. I have the 42RLE. The Jeep runs much better in the rpm band, but I lost around 4 mpg. I saw all these threads about getting better MPG, not worse with a re-gear. I still have the same tires. Just 31x10.50x15. I went from 3.73 to 4.56 gears. I averaged around 16 before and now it is at 12. I gave it a few months to make sure. The speedo is correct. I also double checked with a gps/odbii app that doesn't use the speedo to make sure. Does anyone have any ideas on things to check, or something that might be wrong now, before I start throwing money at it? I've tried a few tanks with barely using the skinny pedal and it didn't change anything. I've shaken the wheels to check the bearings and turned the wheels by hand to make sure nothing is dragging. I also had the shop double check everything, and they said it is all good. Any ideas? I know Jeeps aren't MPG machines, but 12 mpg with only 31" tires doesn't quite seem right from the other info I've seen on here.