is there a dynamic "limit" that anyone is aware of? i tried to achieve my ideal sweet spot driving home today, which is 3 gallons per 106 miles (or the distance from gainesville to orlando). with the a/c engaged 25%, cruise at 58 mph, no headlights, wipers lowest, I could only get to about 34.8 mpg before it plateaued. I stopped once for someone on the side of the road (45 seconds) and took 45 seconds at a toll booth, as well as one 55-95 sprint to get out of the way of a convoy (and to keep my sanity). I carry about 50 lbs of tools in the trunk, as helga hasn't been as reliable as i hoped she would be. is there a formula, like 10 hp for .1 off 1/4 mile time, for the coefficient of friction and fuel mileage? I might be being a little unreasonable expecting 36 from a 4.10 rear end, buuttt....i'd like to at least once make the trip on three gallons exactly.