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Old 05-11-2001, 07:02 AM   #1
TimStevens
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Member#: 4817
Join Date: Mar 2001
Chapter/Region: NESIC
Location: Albanyish, NY
Vehicle:
2012 STI, '02 WRX
'91 MR2, '05 Speed Triple

Question Double-Clutching, Rev-Matching, and Gas Mileage?


In the quest for better gas mileage, I've had pretty good results using the "Drive like a gramma" method (in which I visualize there's a raw egg underneath my right foot, and if I push too hard I'll break it), but I haven't been able to get any sort of steady mileage readings because at least once a week I go out and have some fun on some back roads, and I usually wind up burning 1/8th of a tank of gas in 15 miles or so.

But, that's not why I'm posting. I'm pretty religious about double-clutching and matching revs when I downshift. It was something I picked up on my MR2 with shot synchros, and I hope that continuing to do so in my WRX will preserve the tranny for an extra few miles. But I've got to thinking: how much does all that extra throttle blipping affect my mileage? I was wondering if anyone had some ideas on the subject? I don't down-shift all too often (only when I need a lower gear, not when I'm coming to a stop-sign or the like), but I'm thinking it must have some affect, especially given the heft of the stock flywheel.

Any theories?

-tim
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Old 05-11-2001, 09:02 AM   #2
kyledooley
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It's a diesel

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I think that once I learned to heel and toe downshift really well with my RS that my mileage seemed to drop.

Just coincidence, I think, but worth considering.

K.
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Old 05-11-2001, 09:05 AM   #3
tmat3
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2001 Impreza 2.5RS
BRP

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I would say it's insignificant. I double-clutch all the time, and my mileage has stayed the same between non-double clutch days and double clutch days.

I know you were talking about your gas mileage not being so great at the meet, but I would think that it will get better as you break-in your car more. Also, consider making the car lighter somehow (i.e. get rid of backseats, use lighter wheels).
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Old 05-11-2001, 09:47 AM   #4
TimStevens
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'91 MR2, '05 Speed Triple

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tmat, I'm always bitching about my mileage, and my job, and my pay...

I'm hoping things improve soon when I get some more miles on the car, and I've heard that switching to synthetic will help a bit (plan on doing that at my second oil change). Unfortunately, I can't find any light wheels that are good looking and cheap, not to mention durable...

-tim

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Old 05-11-2001, 10:09 AM   #5
Sean
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Silverado EXT, Yaris

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I doubleclutch and revmatch 100%. Here is my full fuel log from when I bought the car. You'll see that the first 5000 miles has really good mileage where I was babying the car. After that, I let loose on her. You'll see the mileage go down.

http://www.trunkmonkey.com/maintenancelogtemp.cphp


<IMG SRC="http://www.trunkmonkey.com/pics/lil.gif" border=0> Fear the Trunkmonkey. There is no cone.
http://www.trunkmonkey.com/ | sean@trunkmonkey.com
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