Quote:
Originally Posted by zepplin153
I Didnt really think that my economy was all that spectacular at 36.4MPG on my first tank as a Hypermiler. But as I browsed the garage I noticed that most people were getting between 40% and 60% better than the combined rating. So it became very apparent that my results were rather awesome at nearly 100% increased mileage. I live in a very hilly area too.
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That's why. Uphill engine efficiency is great, and downhill you can either coast down w/ the engine off, or if the grade is too steep just coast down in gear. Either way you're going to see high load on average, which correlates to good engine efficiency, compared to flat ground where engine efficiency is worse in most vehicles without taller than stock gearing.