mygt500

I totally agree with you TOMBSTANG but thought I would throw my 2 cents in before others get their panties in a bunch tryng to prove you wrong! Post away my friend ...(I have subscribed to this thread) ..... J

TOMBSTANG

lol yeah good thing you chimed in when you did cause im sure the naysayers are asleep right now but will be swarming in the morning,lol.


So how would I get my exact mpg then guys if my dash is way off, fill me in so next time I can try that rather then just getting a comparison between my gear set ups. a few posted above but im not sure if I get it exactly, point form me out please and thx

Wildmatt

To calculate Mile per Gallon divide miles driven by gallons used.

Fill up the car and reset your trip odometer. Drive the car. Fill up with gas, and see how much fuel the car takes. Look at the trip odometer, and then take the miles driven, and divide it by the number of gallons you just put in the car.

A question I have is after you got the gears installed, did you have the tune adjusted for the gears? Otherwise the computer MPG will be WAY off.

I will say, with under 1000 miles on my car, I am able to average 26mpg over a whole tank driving to work and back, all back roads. However that isn't a lot of fun

CataclysmGT

I added a Whipple and can't get over 20mpg, even at steady cruise. I also don't care........because I have POWWA!!
I do notice that 60mph I get worse mpg then 70-75mph...probably because I am lugging the engine a bit (below torque curve) at 60mph.

wmtheflash

I have 3.73:1, which is about the same RPM in my automatic as a manual will see with 4.10:1. My mileage is pretty close to yours on the highway...22 or 23 mpg. My car would usually return mid 20's when stock depending on my speed. Terrain plays a big role here, too. My 'vette on the other hand regularly returns about +5 mpg or so better than the Mustang on the highway. Mixed driving it's around +2 or +3 mpg better. It's stock.

moosestang

I get 70mpg if I let off and coast from 100mph. My point is calculator it yourself. The computer is not that accurate. Mine always reads 18mpg, but i'm showing 19+ by dividing the miles by the gallons to fill up.

Boozshey

Dude, did you RECALIBRATE your car after the gears. You have to change the it to show the new 4.10's. I am going to call the BS flag on this one cause I know it's not true unless like I said YOU DIDN'T RECALIBRATE your speedo and odometer.

On top of that by no recalibrating you are also gaining about 20% more mileage. So every 10 miles you go your odometer will read 12 miles.

So since google says your trip was around 85 miles your odometer would have read 102. Now do this to a full tank of gas. You will gain 5-8mpg depending on how your driving. I have driven to Miami from Tampa, got about 22mpg with 4.10's.

moosestang

I'd just like to add that I get a solid 2mpg at wide open throttle. Recorded using the aeroforce gauge which gives you a constant mpg reading instead of an average like the cars computer.

marcuskeeler

Yep. +1000

A common mistake is to believe the computer which is now not even able to give you the right numbers after the gear swap. .

MrSandman

I get 26 mpg on the highway cruising at 71 mph. My car is a v6 with a 93 octane tune and 3.73:1 gears.