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Old Aug 9, 2012 | 03:11 PM
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Is there that much difference in gas mileage between auto and 6-speed on a 2000 Corvette?
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Old Aug 9, 2012 | 03:24 PM
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My thoughts would be that the 6-Speed would afford you better gas mileage only because in top gear the RPM's are so low when going 65 that the consumption would be less than the A4 Auto with over drive.

Again... just my opinion. I have driven both and feel like I have gotten better mileage in a Manual vs. an Auto.
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Old Aug 9, 2012 | 03:29 PM
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My '03 auto averages about 21 mpg city & hiway combined
'01 6spd averaged 24.5 mpg overall
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Old Aug 9, 2012 | 03:44 PM
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From my experience in both 6-speed and A4 cars, the 6-speed got around 3-4 mpg better than the A4.
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Old Aug 9, 2012 | 04:40 PM
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Originally Posted by Vetteman Jack
From my experience in both 6-speed and A4 cars, the 6-speed got around 3-4 mpg better than the A4.
Especially for the highway mileage. The 0.5 ratio 6th gear really keeps the rpm down and helps mileage on the 6 speeds.

For information the EPA mileage ratings for 2000 are:

Old rating method
6 speed 18/27 city/highway
Automatic 17/25 city/highway

New rating method
6 speed 16/25 city/highway
Automatic 15/23 city/highway

So the EPA rates the 6 speeds about 2 mpg better than the automatics.
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Old Aug 9, 2012 | 08:13 PM
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I have recently been getting 27.5 to 28mpg out of my 2000 6speed. I just put on OEM c6 wheels as well and it didn't change my mileage any.
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Old Aug 9, 2012 | 09:28 PM
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Originally Posted by QCVette
Especially for the highway mileage. The 0.5 ratio 6th gear really keeps the rpm down and helps mileage on the 6 speeds.

For information the EPA mileage ratings for 2000 are:

Old rating method
6 speed 18/27 city/highway
Automatic 17/25 city/highway

New rating method
6 speed 16/25 city/highway
Automatic 15/23 city/highway

So the EPA rates the 6 speeds about 2 mpg better than the automatics.
The new method is way off I get a confirmed 31.5 over a 150 mile trip at just about 80 mph the entire time. But I do have longtubes, a little less weight and a 6 speed.
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Old Aug 9, 2012 | 10:50 PM
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Originally Posted by m6 c5
The new method is way off I get a confirmed 31.5 over a 150 mile trip at just about 80 mph the entire time. But I do have longtubes, a little less weight and a 6 speed.


I think the EPA numbers are low too (even the old method), but that is what they are.

I have gotten a best of 34.8 on a couple hundred mile trip (all highway with the cruise on at 71 mph). Mine is also a 6 speed with longtubes.

Last edited by QCVette; Aug 10, 2012 at 09:10 AM. Reason: mph added and spelling
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Old Aug 10, 2012 | 08:50 AM
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Originally Posted by QCVette


I think the EPA numbers are low too (even the old method), but that is what they are.

I have gotten a best of 34.8 on a couple hundred mile trip (all highway with the cruise on). Mine is also a 6 speed with longubes.
Yea I always start off trying to get good gas mileage but after just a few min I get frustrated and pick the speed up to around 80...
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Old Aug 10, 2012 | 08:58 AM
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6-speed
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Old Aug 10, 2012 | 09:17 AM
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Final gear * last OD gear on the 6-speed yields lower RPM while cruising than the auto. Also, you lose a little power through the auto so you lose some efficiency.
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Old Aug 10, 2012 | 09:20 AM
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I just got back from 3 weeks in the road in my '04 A4 with the 273 rear end. I got 31.6mpgs on the computer and 30.5 by the gas receipts. Myself, my wife and 132 pounds of gear onboard.
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Old Aug 10, 2012 | 09:22 AM
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I forgot to add that we traveled 4,900 miles.
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Old Aug 10, 2012 | 09:32 AM
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How fast were you going? I seem to get my best economy around 75-78 MPH.
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Old Aug 10, 2012 | 10:16 AM
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I never found out my highway mpg when i was stock since my car was only stock for 2 months, But i do see 26 mpg highway doing 70mph in my A4.

Sad thing is my wifes 00 Rav4 gets 26mpg highway, and has no power and a 4cyl. Ill take the 370rwhp v8 lol
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Old Aug 10, 2012 | 10:17 AM
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The trip varied a lot as to MPH and terrain. We left Montana and headed thru WY, SD, NB, MO, AR, OK, NM, AZ, UT, ID and back home. I pretty much drove the speed limit where ever I happened to be except when traffic was moving faster, such as thru Utah where the limit is mostly 80mph and I was usually doing about 88mph just to keep up.
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