Gear gurus, ? about mpg
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 2,135
Likes: 0
From: Sebastian Florida
St. Jude Donor '06
Gear gurus, ? about mpg
I have 2.59 gears and am thinking about getting 2.73 or 3.07's, how much mpg will I lose with each?
I am thinking 1 mpg w/2.73 and 2-3 w/3.07, I have headers and a very mild cam.
PS. People who say they get 26+ mpg w/4.10 gears, please do not insult me by replying.
I am thinking 1 mpg w/2.73 and 2-3 w/3.07, I have headers and a very mild cam.
PS. People who say they get 26+ mpg w/4.10 gears, please do not insult me by replying.
Le Mans Master
Joined: Oct 2004
Posts: 7,706
Likes: 485
From: Everett WA
C4 of Year Finalist (appearance mods) 2019
My 95A4 only gets 24 on the highway doing about 80 at 2500 rpm and only 15 on my slow daily commute with a 3.07, hot cam, lt headers & yank tc. Up until this point it's been a blast to drive every day
but now it's getting down right expensive
No doubt about it though the tc costs milage in the daily stop & go.
Ifn yer gonna use it for your daily driver stick with what you got. If it's only for the weekends, you will absolutely love the 3.07
but now it's getting down right expensive No doubt about it though the tc costs milage in the daily stop & go.Ifn yer gonna use it for your daily driver stick with what you got. If it's only for the weekends, you will absolutely love the 3.07
Last edited by Mr. Peabody; May 29, 2008 at 12:44 AM.
Race Director
Joined: Aug 2000
Posts: 14,130
Likes: 7
Cruise-In II Veteran
For your needs,a 3.07 will be excellent.After you get used to it,you can see 25+ mpg on the highway depending on speeds.
With my former L98 stock with 3.07's,I saw 28-30 mpg with the stock automatic.That was keeping it under 65 mph though.25 mpg was a realistic number for most highway driving.
A looser torque converter may cause it to drop a little for auto guys.
With my former L98 stock with 3.07's,I saw 28-30 mpg with the stock automatic.That was keeping it under 65 mph though.25 mpg was a realistic number for most highway driving.
A looser torque converter may cause it to drop a little for auto guys.
Safety Car
Joined: Dec 2007
Posts: 3,616
Likes: 5
From: Sandhills of North Carolina
[quote=Randy93;1565660841]I have 2.59 gears and am thinking about getting 2.73 or 3.07's, how much mpg will I lose with each?
I am thinking 1 mpg w/2.73 and 2-3 w/3.07, I have headers and a very mild cam.
Good question as I'm thinking about doing the same thing. Weekend car mostly. Seriously looking at 3.07's.
I am thinking 1 mpg w/2.73 and 2-3 w/3.07, I have headers and a very mild cam.
Good question as I'm thinking about doing the same thing. Weekend car mostly. Seriously looking at 3.07's.
Burning Brakes
Joined: Jul 2007
Posts: 751
Likes: 0
From: Eau Claire Wisconsin
My stock 94 A4 with 3.07's was getting a solid 26mpg at 60mph. Around town and being nice, I would get 18mpg. A little better than my 2000 300m. With the 3.07's I was also able to get 1.9 60 footers on Good Year radial tires as well. Going from 2.59's to the 3.07's would be a good choice I think.
Last edited by GS4-LT1; May 29, 2008 at 06:55 AM.
Safety Car
Joined: Dec 2007
Posts: 3,616
Likes: 5
From: Sandhills of North Carolina
My stock 94 A4 with 3.07's was getting a solid 26mpg at 60mph. Around town and being nice, I would get 18mpg. A little better than my 2000 300m. With the 3.07's I was also able to get 1.9 60 footers on Good Year radial tires as well. Going from 2.59's to the 3.07's would be a good choice I think.
Instructor
Joined: Nov 2006
Posts: 231
Likes: 4
From: Bordentown NJ
These "people" are driving 6spd's, big difference. I was able to get 26 mpg round trip to richmond va a few weeks ago and that included drag racing on sat. I have the stock 3.45 gears.
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Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 2,135
Likes: 0
From: Sebastian Florida
St. Jude Donor '06
Le Mans Master
Joined: Aug 2004
Posts: 5,141
Likes: 7
From: Metairie Louisiana
My 1995 auto with 3.07 rear, 2800 stall, and mods below gets 22-24 mpg at 2k rpm's(70mph highway cruise control). It averages 16.1 mpg overall, verified on paper. I do mostly city driving with one 45 minute highway trip a week. I do have a heavy foot on the gas. I think the 3.07 gear would be perfect for a modified daily driver. If it was a track only car and could hook up without breaking I'd go for more gear.
Drifting
Joined: Oct 2006
Posts: 1,934
Likes: 3
From: Citrus Heights California
I just changed from 2.73s to 3.07s.
I really like the increased performance and I haven't noticed any decrease in MPG.
I have the 700R. I use my OD more now so I wouldn't be suprised if my mileage improved.
I really like the increased performance and I haven't noticed any decrease in MPG.
I have the 700R. I use my OD more now so I wouldn't be suprised if my mileage improved.
Race Director
Joined: Aug 2006
Posts: 18,346
Likes: 1
From: D / FW
I have a lot of mods including built 4L60 E and 373 Dana 44 rear gear.
The car is barely streetable but W/315x35 and the O/D I can cruze at 70 all day at 2500 with 13 MPG .
It see's only weekend drives but I'm planing a trip this summer 800 miles round trip if I can get a getup to beg for gas money at Interstate rest stops.
If you regear a street driven car be sure to add a good trans cooler as an investment in longivity.
The car is barely streetable but W/315x35 and the O/D I can cruze at 70 all day at 2500 with 13 MPG .
It see's only weekend drives but I'm planing a trip this summer 800 miles round trip if I can get a getup to beg for gas money at Interstate rest stops.
If you regear a street driven car be sure to add a good trans cooler as an investment in longivity.
Le Mans Master
Joined: Dec 2005
Posts: 6,999
Likes: 1,685
From: Southeast TX
Do a little math. Your 2.59 in "D" may be pretty close to a 3.07/3.42/or 3.73 in OD. I don't remember the OD ratios, but I'm guessing someone on the board does. I have vettes with the 2.59 and the 3.07. The 2.59 is a dog comparitively. Mileage isn't a huge amount different. Looking for max MPG....leave it alone. Looking for max smiles...swap it out. It can't be more than an MPG or two difference. Probably closer to 1.
Race Director
Joined: Jan 2005
Posts: 10,641
Likes: 13
From: Slidell Louisiana
My 1995 auto with 3.07 rear, 2800 stall, and mods below gets 22-24 mpg at 2k rpm's(70mph highway cruise control). It averages 16.1 mpg overall, verified on paper. I do mostly city driving with one 45 minute highway trip a week. I do have a heavy foot on the gas. I think the 3.07 gear would be perfect for a modified daily driver. If it was a track only car and could hook up without breaking I'd go for more gear.
Now when I swapped from 2.59s to 3.45s my around town mileage actually improved and the highway mileage dropped a mpg or so but my engine was stock back then and pressing the go pedal didn't have as much affect on the accelaration as it does now.
