mitsumotors
NAXJA Forum User
- Location
- Winnipeg
I read a couple post on here saying that people running premium fuel in their xj's seemed to get better gas mileage. I ran a couple tanks and found that i was getting noticably worse mileage when using premium. A mechanic i talked to told me that if my vehicle is not set up to run premium it will not get good mileage if you run it because it runns cooler and will mess up your exhaust temp readings and stuff. can anyone else confirm if this is true?