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Originally Posted by samandw
In scenario #1 we average (17+38)/2 or 27.5 mpg at 60 mph.
In scenario #2 we average (26 + 35)/2 or 30.5 mpg at say 58 avg mph.
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It's possible you did better simply (or at least partly) because you slowed down. Slowing down is pretty much a sure-fire way to enhance mpg. But eventually you reach a limit, with this tactic. The trick is to figure out how to operate more efficiently, which means enhancing mpg without sacrificing distance or average speed. Efficient operation generally means large throttle openings, which is inherently counterintuitive.
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Test 2: decelerate up hills, accelerate down
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Depending on the circumstances, this tends to happen naturally. But if you take this too far, you end up with a large variance between your min speed and your max speed. A moderate variance is OK, but when it's too large it tends to create various problems. The extra aero drag was mentioned. It's also more likely to annoy other drivers, and more likely to create a problem with speed limits.
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Originally Posted by bkrell
the numbers were silly-like 9 uphill then 55 mpg or so downhill.
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That's typical of what happens with an instrument that reports instantaneous mpg. There are wild swings. The implied strategy is obvious: never drive uphill, always drive downhill. Kind of like the classic stock market advice to buy low, sell high. Easier said than done.
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The downhill didn't change much when I dropped the speed and got close to 26 mpg uphill.
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From 9 to 26 is a big jump, and I can't explain that. But maybe it's real, so keep doing it and see what the results are when you fill.
The instantaneous information is helpful, but it becomes more valuable when you put it in the context of a broader interval, like a 'trip' (however you define that).
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Does the fact that I have a turbo car make a difference?
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Good question. I don't know.