quick question about 3.73 and mpg

sade04 · May 2, 2007

Just a quick question...

I just noticed a dramatic change in my MPG after getting gears installed

Right before installation (stock gears)----16.39mpg

1/2 tank stock gears...1/2 tank 3.73s-----15.16mpg

Full tank 3.73s---------------------------------18.25mpg

I understand that with the 23tooth gear, the speedo is still alittle off. So this also affect the odometer? Does anyone know what the % difference is so i can take that into account when calculating mpg? thanks

trav_19 · May 2, 2007

why are you so concerned with mpg?

final5-0 · May 2, 2007

I would have to believe you will see slightly inflated mpg results since you will display about 2 to 3 mph faster at highway speeds than your true speed.

The prob is your driven gear

You can't get your driven gear right on the money unless you go into your tail shaft and change out your drive gear

You do of course have an electronic option with Speedcal and the like

Grady

sade04 · May 2, 2007

trav_19 said:
why are you so concerned with mpg?

i dont know, im just anal about some stuff....ive got an excel spreadsheet keeping track of my gas mileage

final5-0 said:
I would have to believe you will see slightly inflated mpg results since you will display about 2 to 3 mph faster at highway speeds than your true speed.

The prob is your driven gear

You can't get your driven gear right on the money unless you go into your tail shaft and change out your drive gear

You do of course have an electronic option with Speedcal and the like

Grady

ughh i really wish that speedcal didnt cost so much.

BlackVert · May 2, 2007

yeah, the speedo and odometer are now not accurate. it thinks you have gone farther than you really have gone, and it also thinks you are going faster than you really are.

stprorolla49 · May 2, 2007

Wow that mileage isnt that great. I got 24.5ish mpg going 80mph the whole way down from NJ to Georgia

sade04 · May 3, 2007

stprorolla49 said:
Wow that mileage isnt that great. I got 24.5ish mpg going 80mph the whole way down from NJ to Georgia

My car sees only city driving.

Since you have 3.73s, couldnt your MPGs be a little inflated too?

94CobraPace · May 3, 2007

The speedo is approximatly 5% off.

Bosko5.0 · May 3, 2007

I got my speedcal off ebay for $50

sade04 · May 3, 2007

94CobraPace said:
The speedo is approximatly 5% off.

thanks

Bosko5.0 said:
I got my speedcal off ebay for $50

ill keep a lookout....i doubt ill get that lucky though

stprorolla49 · May 4, 2007

sade04 said:
My car sees only city driving.

Since you have 3.73s, couldnt your MPGs be a little inflated too?

Nope, i changed the speedo gear to the white 23 tooth gear, so im about 2 mph off.

quick question about 3.73 and mpg

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