View Single Post
Old 07-17-2010, 11:47 AM   #9 (permalink)
comptiger5000
Master EcoModder
 
comptiger5000's Avatar
 
Join Date: Feb 2010
Location: CT, USA
Posts: 544

RaceJeep - '98 Jeep Grand Cherokee (ZJ) 5.9 Limited
90 day: 13.62 mpg (US)
Thanks: 1
Thanked 26 Times in 23 Posts
Pull the ECU fuse on the car, let it sit for 10 mins, put it back, fire it up and take it for a drive. After having a vacuum leak, re-learning the fuel trims may restore your MPG.

Regarding the high speed sweet spot, consider yourself lucky. You can get the best highway mpg the car wants to give (at a steady speed) without having to dawdle along like the rest of us.
__________________
Call me crazy, but I actually try for mpg with this Jeep:



Typical driving: Back in Rochester for school, driving is 60 - 70% city
  Reply With Quote