dshag

iTrader: (1)

i was wondering if there is a significant change with gas mileage going to 4:10 gears vs stock M6 02 z28? if so how much will it cut it down by? im considering changing gears but dont want it to kill me on gas cause i drive it regularly.

1nastyss

iTrader: (12)

I have a six speed car with 4:11's and i havent noticed a difference , if its any its not much and its well worth it

dshag

iTrader: (1)

I do alot of highway driving at speeds 70+ does that change things?

DEE99TA

iTrader: (7)

My first tankfull showed 3-4 mpg difference. However, my driving my not have been typical(trying out new gears) and I had colder nitrous plugs installed. I do about 28 miles/day ranging from 55-75mph. Then about 12 miles of town driving.

I am about at half a tank, I will know more in a few days.

If you do alot of city driving you may not notice it. However, at highway speeds it is like you are driving in 5th.

white mongoose

iTrader: (3)

i dint see a big difference through my 9" 4.11

JimsWS6

iTrader: (1)

I wondered about that also before I chose a gear. Before and after the swap I drove on an 2 hour round trip same weather conditions. 3.42's= 29.2mpg, 4.10's= 29.8. Both at same speed tops out


Later on this summer I took it to a cruisin which was an hour away and got 30.2 withthe tops out, and got on it a few times. 6th gear becomes useful

dshag

iTrader: (1)

wow i figured it would lower mileage to below 25...thats impressive

EPP

iTrader: (22)

It certainly does make 6th gear more useful with the gear change. The effects that the gear change has on your gas mileage is going to depend on how fast you normally drive. If you run 75 to 85 much of the time you may want to consider 3.73 gears. Bob

pddye

iTrader: (14)

With a 4.10 12 bolt and cam i was averaging 20mpg between city and highway, but I had a problem with not keeping me foot out of it.

Now my th350 with 3.73 12 bolt and h/c is a totally different story. best i've got yet was 11 mpg! haha

Jon5212

iTrader: (2)

I run 70-80 on the highway in 6th and I'm still just a hair over 2K RPM... my last road trip netted over 30 MPG.

BlackScreaminMachine

iTrader: (17)

Just remember if a car hasnt had a tune done, you may not see the gas milage like some people say, they tend to be pig rich on the low end.

@ 70 I revved approx 1.5k rpms and that was on 3.42's and on the 4.10's I now rev 2k even.

armkneez8

iTrader: (1)

Not much difference. All I can say is it's fun!!

LS1crazy01

iTrader: (14)

Hey just out of curiosity are you guys with bolt on cars or 6200 rpm rev limiter in 4th or 5th in the 1/4?

Dont mean to high jack sorry.....

pddye

iTrader: (14)

i always pulled 6500 rpm in 4th in my m6 on a 26" tire at 125 mph but I never knew how correct my tach was because i should have had a few more mph left by the calculations. I was going to go to a 28" tire like i have with my trans am now with the th350.

LS1crazy01

iTrader: (14)

Sorry I should have said M6 guys.

mcflyz28

14 city 22 highway, rev limitor 6700,banging off of it

Demonicbird00

iTrader: (17)

w/ hp and times in sig.... i have a gto tranny and 4.10s..... i still get 21+mpg on the highway

-brandon

Z28Red01

I went aprox 260miles on 1/2 tank.

LSGUNSS

iTrader: (41)

I get 20 in town and 26 on the highway. I love the way the 4:10's and the M6 work together. I think it should be an option from the factory.