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Old 06-01-2013, 07:16 PM   #161 (permalink)
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108!

I heart boat tails:



That's one way: secondary highway route, cruising at/near the limit of 80 km/h / 50 mph, going through 2 small cities, with lots of engine-off coasting to stops turns, plus speed zones through multiple small towns.

(Yes, I'm such a nerd that I'm posting my fuel economy from a cottage in the middle of the weekend... though in my defense, it's raining at the moment. We just beat the rain back to the dock!)

My previous best for this leg of the trip is high 90's, if memory serves. Will confirm when I get back.

EDIT: wrong - previous best was 103. See below for more details on best & average MPG for this trip which I've been taking for several years in the Insight.

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Old 06-01-2013, 08:06 PM   #162 (permalink)
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Old 06-01-2013, 08:15 PM   #163 (permalink)
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IIRC, with MPGe numbers like that you would have been an
X-Prize (Mainstream) contender.

But then, it would be difficult to spend the $5M (US) prize wisely.
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Old 06-01-2013, 09:11 PM   #164 (permalink)
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Old 06-01-2013, 09:51 PM   #165 (permalink)
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Old 06-02-2013, 10:17 AM   #166 (permalink)
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The X-Prize was for an EPA Combined rating of 100+MPG; which is considerably harder than the maximum. The Edison2 VLC X-Prize winner got 129MPG on the Highway rating, and at ideal speeds, it probably would be higher than that.

Go Darin, go!

Question: did you modify the sides of the boattail, after the tuft tests?
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Old 06-02-2013, 04:15 PM   #167 (permalink)
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Great result and tail looks great. I wish I could build a tail for Berta...
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Old 06-02-2013, 09:52 PM   #168 (permalink)
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109

The car is practically making gasoline now, it's so efficient.



109.7 MPG (US) for the return trip.

I've kept tabs on my fuel economy for this trip because I make it a couple of times each year, and always on the same route.

Some stats from those numbers ...

- average: 95.8 mpg (US), round trip
- previous best, going: 103.0
- previous best, returning: 102.9

Quote:
Question: did you modify the sides of the boattail, after the tuft tests?
Nope, I didn't bother.
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Project MPGiata! Mods for getting 50+ MPG from a 1990 Miata
Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
Mitsu mods: 70 MPG in my ecomodded, dirt cheap, 3-cylinder Mirage.
Ecodriving test: Manual vs. automatic transmission MPG showdown



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Old 06-03-2013, 01:08 AM   #169 (permalink)
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Someone should do a car rally where they mimic the EPA Combined cycle, instead of a poker run.

Oh, and...
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Old 06-03-2013, 04:24 AM   #170 (permalink)
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Quote:
Originally Posted by MetroMPG View Post
I suspect zigzag tape would only "work" where there's laminar flow. It's just too thin, and the boundary layer is way too thick and turbulent over most of the car -- and getting worse the further back you go.
1 mm is definitely too thin at the rear of a car, but enough on the A-pillar.

Glider zig-zag tape is usually only half that thickness, so DIY would be the way to go for anything but the front.

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