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Old 03-29-2012, 07:33 PM   #2 (permalink)
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I generally let the speed increase and then bleed it off climbing the hill. The extent to which you do this depends on the max elevation of the hills. You could also try coasting downhill even if your speed increases. Think of the roller coaster and how it climbs and descends without any additional power. The closer you can come to that type of movement, the less fuel you will use.
What you are experiencing is changes in load independent of throttle position. Every hill gives you the opportunity to use the mass of your vehicle to store energy. While the mileage climbing the hill may seem terrible, remember you can coast downhill with the engine idling or even shut off (if its a manual transmission) and use no fuel whatsoever going downhill.

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