I'm getting close to 19 city and 24ish hwy running 3.0 auto 32's amd 4.10 gears, but I also am running a programmer.

 

I noticed there are 2 different topics in this thread,,, to chime in on both of them, I am converting my '99 to the '01-'03 front end


And my best is about 18 mpg all highway, usually closer to about 16 overall. Thats ok until you drive 300-400 miles a week. But hey, my miles are tax deductible!