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Old 01-11-2019, 04:51 PM   #1 (permalink)
MaxACL
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Fuel mileage and Japanese algebra

I have pondered this for some time:

(Assume I get 10 mpg average while towing on level ground) If I climb a mountain range that is ten miles up, then ten miles down to the same altitude as when I started, will I still get an average 10 mpg?

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Old 01-11-2019, 05:09 PM   #2 (permalink)
OkDually
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Thread moved to "Other Performance Discussion"..

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Old 01-15-2019, 02:54 PM   #3 (permalink)
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Nope is the short answer. It takes more fuel to climb a hill verses coasting down it.
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Old 05-03-2019, 11:25 PM   #4 (permalink)
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in terms of work done, in theory it ends up being zero. In practice the delta in work is not zero, it is positive. So, no, you won't still get 10mpg. even if you were in neutral going down, you would still be consuming fuel, and thermal efficiency of the engine will be lower going up than going down. And going down, wind resistance will "consume" some of the "work" subtracting from your mpg So, in the end you will see less than 10mpg average.
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Old 05-04-2019, 12:13 AM   #5 (permalink)
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What time of day? Headwind? What speed?
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Old 05-04-2019, 08:56 AM   #6 (permalink)
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I can get better economy in the hills. The key not to maintain speed.
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