Just got 26 MPG on my road trip...how much will 3.73s hurt?
09-17-2010, 07:30 PM
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Car: 99 WS6 / 00 SS / 11 CTS-V / 13 300
Engine: LS1 / LS1 / LSA / 5.7 Hemi
Transmission: 4L60E / T-56 / 6L80E / W5A80
Axle/Gears: 3.23 / 3.42 Auburn / 3.23 / 2.62
Just got 26 MPG on my road trip...how much will 3.73s hurt?
So, with my M5/3.08 geared LO3 I just got 25.5 MPG for my 275 mile road trip from MA to ME this week. I'm leaving tomorrow, and expect to get about the same MPG on the way home. This is 90% highway, doing between 70-80 MPH.
I have a 3.73 posi rear from an '83 L69 sitting in my garage I was going to swap into it over the winter. After this great display of MPG though, I wonder...with all else being equal, how much will my MPG decrease? 2-3 MPG on a trip like this? 1-2 MPG around town?
I have a 3.73 posi rear from an '83 L69 sitting in my garage I was going to swap into it over the winter. After this great display of MPG though, I wonder...with all else being equal, how much will my MPG decrease? 2-3 MPG on a trip like this? 1-2 MPG around town?
09-17-2010, 07:58 PM
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Car: basic third gens
Engine: that I like
Transmission: to restore
Axle/Gears: and enjoy
Re: Just got 26 MPG on my road trip...how much will 3.73s hurt?
Yeah, I'd guess you would lose 2-3 mpg. My old '92 that was auto and 2.73's would get 27-28 mpg under the same conditions.
09-19-2010, 02:27 AM
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Re: Just got 26 MPG on my road trip...how much will 3.73s hurt?
I say you lose at least 5 mpg.
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