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My main trip that I do regularly with the car is across the interstates of WV..
My best tanks have been me staying roughly 60 mph, and going for as long as possible while keeping the torque converter locked in 4th gear. (Automatic) after it unlocks, I keep the throttle in the same position, and only apply more if I get more than 20 under the limit. (Only happens on the steepest of hills)
Coming back down the hills, I put it in neutral right at the crest of the hill, gravity is usually enough to get me moving back up to the speed limit, and I put it in gear again going uphill whenever I'm back to about 60 mph. I know that it should be more efficient keeping it in gear, since theres no fuel, but on a small engine it can idle for how many hours per gallon? With no load holding me back, I've found my 2 ton car can coasts for ridiculous distances, I've been in neutral for over 2 miles before and could have gone longer, but I would have been going slower than 45 mph.
All this, and I've got to 34.4 mpg on a 26 EPA car. 40 might be attainable after all.
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