.6 mpg is pretty good! That is about a 5% gain for you.
I've never really noticed a difference from resetting the computer but I'm sure it makes a difference.
Funny enough, the largest gain I have noticed is from my larger throttle body. In theory it doesn't really make sense, but that was the first time I ever hit 19 mpg in my jeep. I'm pretty sure a spacer will be a waste of money though.
Right now my jeep isn't even driveable. The fans killed my battery. I will be upgrading to 136 amp alternator so my jeep can handle the load from the fans. I think my stock one is only rated for 90 amps.
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