5gal = 2MIles of WOT
MPG difference 2.59 vs 3.07
Thread Starter
Pro
Joined: Oct 2009
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From: vero beach florida
MPG difference 2.59 vs 3.07
Swapped out my son's 2.59 for 3.07, before I did that, I went up on the interstate, reset MPG after setting cruise to 70 and drove for 10 miles. After swap did the same thing, reset MPG at same spot(used a billboard) and after doing that, the 3.07 got 25.2 mpg and the 2.59 got 29.6.
One note, the run w/2.59 was a clear day slight breeze and run on 3.07 was windy and cloudy, temp was about the same.
SOTP feel w/3.07 is noticiable but not a big difference from a standing stop, over 2.59.
This car has headers and 2300 stall converter and is a 93 a4.
One note, the run w/2.59 was a clear day slight breeze and run on 3.07 was windy and cloudy, temp was about the same.
SOTP feel w/3.07 is noticiable but not a big difference from a standing stop, over 2.59.
This car has headers and 2300 stall converter and is a 93 a4.
Racer
Joined: May 2009
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From: van buren ar
Pro
Joined: Jan 2010
Posts: 677
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From: Southern Indiana
Do you remember what the rpm at 70mph with both gears was?
I have 2.59s in my 88 L98 and am considering swapping to some 3.07s in the future as well. Would be interested to hear of how this swap affects L98 mpg. Anyone?
Also, just for knowledge's sake, what other gear ratios are available between 3.07 and 3.45? Anything?
I have 2.59s in my 88 L98 and am considering swapping to some 3.07s in the future as well. Would be interested to hear of how this swap affects L98 mpg. Anyone?
Also, just for knowledge's sake, what other gear ratios are available between 3.07 and 3.45? Anything?
Burning Brakes
Joined: Jun 2008
Posts: 892
Likes: 1
From: New Smyrna Beach Florida
Do you remember what the rpm at 70mph with both gears was?
I have 2.59s in my 88 L98 and am considering swapping to some 3.07s in the future as well. Would be interested to hear of how this swap affects L98 mpg. Anyone?
Also, just for knowledge's sake, what other gear ratios are available between 3.07 and 3.45? Anything?
I have 2.59s in my 88 L98 and am considering swapping to some 3.07s in the future as well. Would be interested to hear of how this swap affects L98 mpg. Anyone?
Also, just for knowledge's sake, what other gear ratios are available between 3.07 and 3.45? Anything?
Team Owner
Joined: Jan 2009
Posts: 73,568
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From: Somewhere in Mo
St. Jude Donor '09-'10, '14
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Thread Starter
Pro
Joined: Oct 2009
Posts: 679
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From: vero beach florida
Do you remember what the rpm at 70mph with both gears was?
I have 2.59s in my 88 L98 and am considering swapping to some 3.07s in the future as well. Would be interested to hear of how this swap affects L98 mpg. Anyone?
Also, just for knowledge's sake, what other gear ratios are available between 3.07 and 3.45? Anything?
I have 2.59s in my 88 L98 and am considering swapping to some 3.07s in the future as well. Would be interested to hear of how this swap affects L98 mpg. Anyone?
Also, just for knowledge's sake, what other gear ratios are available between 3.07 and 3.45? Anything?
Pro
Joined: Jun 2007
Posts: 626
Likes: 2
From: Coquitlam British Columbia
Do you remember what the rpm at 70mph with both gears was?
I have 2.59s in my 88 L98 and am considering swapping to some 3.07s in the future as well. Would be interested to hear of how this swap affects L98 mpg. Anyone?
Also, just for knowledge's sake, what other gear ratios are available between 3.07 and 3.45? Anything?
I have 2.59s in my 88 L98 and am considering swapping to some 3.07s in the future as well. Would be interested to hear of how this swap affects L98 mpg. Anyone?
Also, just for knowledge's sake, what other gear ratios are available between 3.07 and 3.45? Anything?
Drifting
Joined: Jul 2006
Posts: 1,483
Likes: 3
From: Newark, New Jersey
Do you remember what the rpm at 70mph with both gears was?
I have 2.59s in my 88 L98 and am considering swapping to some 3.07s in the future as well. Would be interested to hear of how this swap affects L98 mpg. Anyone?
Also, just for knowledge's sake, what other gear ratios are available between 3.07 and 3.45? Anything?
I have 2.59s in my 88 L98 and am considering swapping to some 3.07s in the future as well. Would be interested to hear of how this swap affects L98 mpg. Anyone?
Also, just for knowledge's sake, what other gear ratios are available between 3.07 and 3.45? Anything?
Le Mans Master
Joined: Oct 2004
Posts: 7,706
Likes: 485
From: Everett WA
C4 of Year Finalist (appearance mods) 2019
Swapped out my son's 2.59 for 3.07, before I did that, I went up on the interstate, reset MPG after setting cruise to 70 and drove for 10 miles. After swap did the same thing, reset MPG at same spot(used a billboard) and after doing that, the 3.07 got 25.2 mpg and the 2.59 got 29.6.
One note, the run w/2.59 was a clear day slight breeze and run on 3.07 was windy and cloudy, temp was about the same.
SOTP feel w/3.07 is noticiable but not a big difference from a standing stop, over 2.59.
This car has headers and 2300 stall converter and is a 93 a4.
One note, the run w/2.59 was a clear day slight breeze and run on 3.07 was windy and cloudy, temp was about the same.
SOTP feel w/3.07 is noticiable but not a big difference from a standing stop, over 2.59.
This car has headers and 2300 stall converter and is a 93 a4.
I have a 95A4 with a 3.07, lt headers and a 3200tc and drive 50 miles every day. On an uncrowded highway at a flat 70mph I average about 23 and in daily commuter stop and go about 16.
I drove quite a few late model C4s with both 2.59 and 3.07 before I bought mine and frankly I thought there was a world of difference between the two .... not so much from a dead stop but much more on the road say when flooring it and going from 40 mph - 80 mph. To me it felt like I had two additional cylinders. I'm very happy that I went with the 3.07 but yes there is a difference in gas milage.
Hope this helps
Last edited by Mr. Peabody; Mar 7, 2010 at 01:35 AM.
Instructor
Joined: Apr 2009
Posts: 115
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From: Rising Sun Md.
For what its worth, ..I'm going to leave the tall gears in my 87...its fast enough for me and I love the mileage,..My alternative vehicle for a commuter is (you should be sitting down)..a 93 C1500 454SS,..running a 496ci BB 4.10 gears and 2500 stall with a Lunati roller cam ....my gas mileage?...8.5highway and 4 stoplight to stoplight?
Le Mans Master
Joined: Mar 2002
Posts: 5,889
Likes: 2
From: Castro Valley Calif.
St. Jude Donor '03 thru '26
Here's a thread about mileage on my '87 A4 w/3.07s:
http://forums.corvetteforum.com/c4-t...s-mileage.html
I did the math when I filled up & my actual was about 27 1/2
http://forums.corvetteforum.com/c4-t...s-mileage.html
I did the math when I filled up & my actual was about 27 1/2
Thread Starter
Pro
Joined: Oct 2009
Posts: 679
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From: vero beach florida
Well folks, I messed up. When I did my rearend swap, I also changed the oil and took out the A.I.R. system. Seems I disconnected one of my o2's.
Hooked it back up and redid the test and I got 27.4 mpg at 70. :o
Hooked it back up and redid the test and I got 27.4 mpg at 70. :o
Instructor
Joined: Nov 2008
Posts: 196
Likes: 3
Are you getting the mpg from the readout or did you do the math? My 86, with the 3.07 rear gets 23 highway and about 16 in town. It has no running issues and is totally stock. Originally the readout showed 23 in town and about 27 highway. It was not getting that mpg. I put a pcmforless chip in it to turn my fans on earlier and dump egr. It now reads right and works out if I do the math. The thing is, it always got the same mileage, just the readout was wrong.
Thread Starter
Pro
Joined: Oct 2009
Posts: 679
Likes: 0
From: vero beach florida
Are you getting the mpg from the readout or did you do the math? My 86, with the 3.07 rear gets 23 highway and about 16 in town. It has no running issues and is totally stock. Originally the readout showed 23 in town and about 27 highway. It was not getting that mpg. I put a pcmforless chip in it to turn my fans on earlier and dump egr. It now reads right and works out if I do the math. The thing is, it always got the same mileage, just the readout was wrong.
And my car has headers and stall converter.
