I do about the same as Doofus. A hill is a hill and you are stuck climbing it. A little run up it whether from a flat road, or a previous downhill, will help get up it with little MPG loss. Back off the throttle as you go up, or back off near the end and "coast" up will be good. Now a big long hill - another story. Stay in your overdrive gear, low RPMs (don't get crazy though) and steady throttle all the way up; towards the end you want to gradually back off the throttle and get over the top enough to stay in your overdrive gear. If you have to down shift due to timing the top wrong, don't fret - it still works out ok with not a whole lot of MPG loss.
Some of my hills are rolling grasslands, so I can sometimes gain a tenth of an MPG from hill to hill if I do it right.
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