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Old 07-25-2007, 02:18 PM   #1
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Lightbulb Writing a book on hypermiling

Howdy! I'm a hypermiler in North Texas, and I'm working on a book on the subject. I'm by no means an expert, or even an advanced hypermiler, but I've managed to improve my mileage by about 50% above the EPA standard, so I'm satisfied that I've got something to contribute.

Question 1:

So here's what I'd like some expert consulting on. I'm going to divide three chapters up into Basic, Intermediate and Advanced techniques, all related strictly to driving practices (the engineering and mods will be covered separately). Also, drafting doesn't fall into those chapters (see next question).

Question 2:

I'd like comments on the following. I find the whole drafting thing dubious. Based on the experiments on Mythbusters and my own experience, I find three factors severely limit the efficacy of drafting behind a truck:

1. Getting close enough to make a significant difference requires continual braking and acceleration, which offset much of the advantage.
2. Falling back to a distance that doesn't require #1 reduces the efficacy, and often invites a car from another lane to cut in front of you, causing you to fall further back, etc.
3. Trucks often drive faster than the speed limit, so whatever gains you make are offset by the increased resistance of your faster speed.

All this, combined with the safety problems, leads me to recommend against it altogether.

Question 3:

High revs - low gear vs. low revs, high gear. I've gotten conflicting information on that.

Thanks!

CBB
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Old 07-25-2007, 02:33 PM   #2
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re: Question 1:
I'm not sure that was a question

re: Question 2:
Drafting works, but is wrong. Do you like being tailgated?

re: Question 3:
low revs, high gear, no question
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Old 07-25-2007, 02:44 PM   #3
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Question 1: Oops, you're right. The question should be:

What do you recommend for each of these categories?
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Old 07-25-2007, 02:52 PM   #4
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drafting works really well and is somwhat safe. 39mpg in my car at 72mph shows that. i did that over 80 miles also not just for a little while.
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Old 07-25-2007, 03:01 PM   #5
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How far behind did you draft, roughly? Those numbers argue pretty well for it, I guess.
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Old 07-25-2007, 03:14 PM   #6
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FeynmanFan -

Welcome to GS! I'll bet you've already looked at the Glossary :

GS FAQ/Glossary, Busted/Confirmed Mods, Archive
http://www.gassavers.org/showthread.php?t=1088

American Trucking Association Says: Don't Draft! - id's two websites promoting it
http://www.gassavers.org/showthread.php?t=3853

Drafting 18-wheelers....revisited
http://www.gassavers.org/showthread.php?t=3488

CarloSW2
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Old 07-25-2007, 04:21 PM   #7
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Little to No Drafting

On the 2 vehicles in my garage, the FE improvements were attained with little if any drafting. After seeing some debris thrown into a vehicle lately (everyone was OK, thankfully), I'm really cautious of this practice with trucks. Cars are too unpredictable and stop too quickly to consider. After much consideration, I can't recommend it.

IMHO, each chapter should be broken into 2 categories: modifications and technique. From Novices to Intermediates, mods can account for a good foundation. Technique of all sorts carry the rest.

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Old 07-25-2007, 06:54 PM   #8
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The book should be called... join gassavers.org.
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Old 07-25-2007, 07:29 PM   #9
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Indeed, in any book on this kind of topic, the chief piece of advice is "get involved with the people who are experts online." GasSavers will get a healthy dose of credit and reference...
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