I have gone and done it !
FR500 Member
Joined: December 9, 2011
Posts: 3,584
Likes: 6
From: Corpus Christi, TX
I hear that some companies are looking at putting 7 speed manual transmissions in their cars. I wonder if a 7 speed is really the answer to better fuel mileage. Do we really need another gear in a car like a GT500 ? I would think a 5 speed could get the job done with 5th gear being the high mile per gallon gear. The more gears added to a trans has to add weight to the trans. I would think the lighter the cars , the more the fuel mileage would improve.
Thread Starter
Cobra Member
Joined: March 29, 2011
Posts: 1,265
Likes: 6
From: Minnesota
I would think a 5 speed manual trans with one overdrive gear could provide the same gas savings as a 7 speed . With my GT500, I am going fast enough in 4th gear to shift into 6th gear. Once on the highway, I have very little need to be shifting often. The most frequent shifting is done in town, but then I have no need to use 5th or 6th gear. So how is a 7 speed trans going to save gas in town ? Now if I had a 4.80 rear gear, then I could see how a 7 speed trans could save gas.
Shelby GT350 Member
Joined: January 24, 2012
Posts: 2,352
Likes: 2
I would think a 5 speed manual trans with one overdrive gear could provide the same gas savings as a 7 speed . With my GT500, I am going fast enough in 4th gear to shift into 6th gear. Once on the highway, I have very little need to be shifting often. The most frequent shifting is done in town, but then I have no need to use 5th or 6th gear. So how is a 7 speed trans going to save gas in town ? Now if I had a 4.80 rear gear, then I could see how a 7 speed trans could save gas.
Bullitt Member
Joined: August 28, 2013
Posts: 396
Likes: 7
From: Knoxville, TN
It would depend on the gear ratios...just because you have more gears doesn't mean you will automatically get better gas mileage. Probably will, but not a given.
Last edited by EastTNMustang; Feb 28, 2014 at 02:40 PM.