nrwphoto
NAXJA Forum User
- Location
- Appleton, WI
1998 4.0, AW4, Select-Trac, 3.55 gears, 30x9.5 Goodyear Silent Armor other wise it's stock with 120,000mi now on it. When I purchased this Jeep 2 yrs ago it had 235/75R15 street biased tires on it and I averaged 20mpg with mixed driving. High side of 24 on the highway to the mountains and low of 17 in the city. After upgrading the tires (about 1yr ago) my mileage dropped by about 1mpg city and 2mpg highway but still pretty good for a 6cyl, 4x4. Then over the last 6 months my mileage started going down. It has now stabled off at 12.5-13mpg with mixed driving, the lowest I have got was only 9mpg, the high these days is 15mpg on the highway. I have also lost some power, has to down shift into 2nd when pulling 5-6% hills at 60 mph. (I really don't like it running at those higher rpms for very long) Compression reads a very high 155-162 across the board, spark plugs look like new after 20,000mi, does not blow smoke or burn any oil, coolant looks clean and like new after replacing cooling system 2 summers ago. No check engine light, and only code that pulls out of the computer is for a low signal from sending unit. Any ideas would be very appreciated.