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Old 08-10-2010, 07:48 PM   #9 (permalink)
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Depends on the hill. Ideally (without Roberts Lean burn Insight) You can climb the hill at a higher BSFC than on flat ground. Then you can coast downhill with the engine off and use no fuel.

As long as you monitor your uphill consumption and keep it as low as possible, you will do better than you would on flat ground.

You can also (if the hills are just the right grade) avoid the exponential increase in aero drag that you would suffer when you pulse to a higher than average speed on flat ground.

I don't have hills in my local area that are steep enough to maintain average speeds over 40 MPH downhill.

If you can coast at the posted speed limit downhill, and the uphill grades are about the same, you are lucky enough to have a hyper-milers ideal terrain.

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