Many cars have a place in the throttle that feels heaver. Using my MPGuino I can see when I go past that point the fuel mileage drops significantly. it drops linearly with the pedal from ~24 to 20 coming up to the stiff point then straight to 16 or less after the heavy point. I find that a slight acceleration up to about 10 over before the hill allows me to decelerate a little less going up the hill as the engine spends more time closer to where it makes more power.
If you have to down shift keeping the engine loaded is good. Pick a gear where you can keep about that 80% without slowing "too much".
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