Anybody else considering ditching 4.10s and going back to 3.55s? My rear end is junk and it needs to be rebuilt. I'm seriously considering going back to 3.55s now. I'd gain about 5 mpg highway. that's about 80 miles per tank or 3.2 gallons per fill up. At $4 a gallon that would save me about $13 a fill up, or $0.80 a gallon. Wow that sounds like a lot when you do the math.

Basically I'd save $0.04 a mile and driving 20k miles a year that would add up to $800 a year. Not sure if 4.10s are worth 800 a year

 

Depends on how much enjoyment you derive from driving. For me, I chalk up the extra cost of having a modded Mustang to my entertainment budget. Speed is my vice. I don't smoke, drug, drink, or frequent Starbucks, so all of that money goes to gasoline and spirited driving instead.

 

I have the 3.73's and dropped to 14.5 city with my gear change. Just installed Summit CoP's and improved just under a 1 mpg.

Five Oh Brian, when's our weather gonna improve? Seems more like fall than spring/summer these days LOL

 

I'm sure some people are..... you know, the same kind of guys that get out of the shower to take a leak.

 

You mean sit down to take a leak.

 

 

Like they say around here: Q - "how can you tell when it's summer in Seattle?" A - "the rain gets warmer!"

With 4.10's (before the supercharger) I was getting about 15 mpg in town, but 26-27 mpg on the highway (at 60-65 mph) or 23-24 mpg highway (70-80 mph).

I don't think switching back to factory gearing will help fuel economy dramatically. Changing one's driving style would be more effective, IMO.

 

Hey Brian,

Is it true that people in Seattle dont tan - they rust? Sorry, I couldnt help myself on that one You know - I used to live there

Hows the S/C working for ya?

Page

 

I've got the 4.10's and while not romping on it as often as before - I'm still getting about 21 with city/light hwy driving. I drive about 27 miles each way to/from work - about 15 of it is highway.

I wouldn't consider changing back......no way.

 

I'll stay with my 4.10's even when gas hit's $10 a gallon. Then again my daily commute is 5 miles round trip.

 

Yeah I gotta love that 4 mile commute of mine, Ive never had a job where I can go home for lunch

 

Can also trade it in and get a Prius.

Seriously, you own a Mustang GT. And yeah, it's a performance vehicle that gets crappy mileage, but fun to drive. Your call though.

 

Got to agree Bill. You got to decide what your priorities are. Fun or economics. Only Dustin can really answer your original question. But on a side note. I am glad I still have my 3:31 gears in the car.
Scott

 

I'll stick with 3.73's thank you very much, I'm not sorry 1 bit about my gear change

 

Yea, I'm pretty happy with my 3:55 gears. They seems to give the best compromise between good performance and fair economy.

 

If you didn't know that I'm not a smart man when it comes to gears, you will in a second...

I don't understand why you can't have some super tall gears like the 4:10's we all love for the lower gears but than have a super duper road gear for the highway, so when I shift from 4th into 5th it's more like what a 7th gear would be. Now, am I stupid or did I just solve the entire worlds fuel economy problem?

All hail me (unless I was being stupid)

 

how much do you guys think i would lose in the city going from 3.31 to 3:73

 

Possibly one reason the Z06 gets the same MPG we do.

 

I lost about 1mpg

 

wow if i had that kind of commute i'd ride my bike to work every day. Save all the gas for fun and I could lighten the driver/car combo by about 20lbs...