Lotsa flat roads in your area? I have a friend in Nebraska and another on OK that report getting very high mpg results and I believe it's the long, flat stretches. Trying to duplicate that tuning in hilly New England results in lean cruise with frequent jaunts into PE. End result is much smaller gains.My old 83 G20 with a mechanical q-jet would often get 20-21 mpg highway. LE9 305 with flat top pistons and 601 heads and factory catless dual exhaust with factory tubular manifolds off a 1-ton 350 van that I had added a dr gas x-pipe into. Van had a 700r4 and 3.08s.
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