Quote:
Originally Posted by menendez1293
it will also burn a tad bit more fuel because of the 3.91s
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Quote:
Originally Posted by Spartan01
and 3.91 gears as opposed to 3.45 for the final drive ratio. Because of this it will get slightly less MPG.
The 1LE is only available as a manual transmission.
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Both statements above are incorrect in regards to mpg because of the 3.91 in the SS/1LE. The 3.91 is only half of the overall ratio, the other mutiplier is in the trans which is different between standard SS and SS/1LE and it has different gearing in the SS/1LE (MM6) vs. the SS (M10)
As you can see below the overall gear ratio (
in red) is almost the same between the SS and the SS/1LE in most gears and almost identical in the over drive gears (5th/6th) so the delta in mpg should be negligible.
MM6 w/ 3.91
1st gear ratio: 2.66
10.42
2nd gear ratio: 1.78
6.97
3rd gear ratio: 1.30
5.09
4th gear ratio: 1.00
3.91
5th gear ratio: 0.74
2.90
6th gear ratio: 0.50
1.96
M10 w/ 3.45 w/ 3.91
1st gear ratio: 3.01
10.38
2nd gear ratio: 2.07
7.14
3rd gear ratio: 1.43
4.93
4th gear ratio: 1.00
3.45
5th gear ratio: 0.84
2.90
6th gear ratio: 0.57
1.97
The other (bigger) difference to look at that can effect mpg can come from the OD of the rear tires. The SS uses a 275/40/20 (taller) and the 1LE runs a 285/35/20 (shorter). A short tire on the same car is similar to putting a numerically larger rear end gear in the car: IE the RPMs are higher at a given speed.
275/40/20 = 28.66" OD
285/35/20 = 27.85" OD
Overall I would bet mpg is about the same.....Your foot will dictate the mpg.you get.
-Matt