[comptiger5000]

I saw your posts about this over on Bobistheoilguy earlier. MPG gains with a cam seem to vary a bit, depending on gearing, displacement, engine load, etc. You also might need some tuning (altered timing curve, etc) to get the most from it.

Between the better flowing heads (with slightly thinner head gaskets for tighter quench, and about 0.3 bump in compression), better exhaust, and cam / roller rocker combo on the Jeep, I seem to have picked up about 1mpg on the highway, and think I can pull a bit more out of it as I work on the tuning. My city mpg is down about 0.5 mpg though, but part of that is due to engine / tranny tuning. I don't think I'll see any gains off the highway though.

I used to get between 17.3 - 17.5 mpg pretty consistently on the run between Rochester and home in good weather (saw 17.8 once on the same route). On the last 2 runs, I've seen 18.43 and 18.35 mpg, and those were with the cruise set at 62 (rather than my usual 60), and no drafting (I usually try to do a little distant drafting). Now I'm curious what it does for mpg with a trailer behind it, especially considering it has more power, and some tranny upgrades, I should be able to use OD (1750 rpm at 60mph) with a trailer on flat ground, and only have to drop it to 3rd on the hills, rather than running in 3rd (2600 rpm at 60 mph) all the time when towing.