PurpleIcedGT

Do you remember being caught in a lie about your "gears" and your mileage? How is the HE double hockey sticks are you able to repeat the same thing 500 times over and over and over again? Once again, your statement about 4.30s and 4.10s is weak and inaccurate.

We are all waiting for proof in all HE double hockey sticks that you own A mustang, A STI, AND/OR Both. Until there is that proof, you're a floozy.

H0SS302

My gas mileage is worse with 3.73s than it was with 4.10s because of city driving. The difference on the highway driving can be offset by slowing down a few mph if your that worried about it. 4.30s are only a 150 rpm difference, thats nothing.

I already cant wait for you to go on vacation again.

grogan

I have 410s and wish I started with 430s. I'm going all out now with a 456 strange spool 33 spline axles and their pro race brakes.

WhiteFoxGT

stangalator

Same here, I have averaged ~25mpg on the highway and 20 in the city with my 4.10s. With my boat anchor 2.73's i had worse city but a hair better highway. Not enough to keep the gears at all, I'm talking 2 mpg MAX. on average maybe 1 mpg.

I think you have the right idea. Your rpm is higher but you are drawing about the same cfm of air with less throttle. If I was to do it again I would never look at anything lower then 4.10s, anything less is a complete waste.

My only woe with them is a small first gear in city driving starts. However sometimes I start in 2nd and its fine. Pros vastly out weigh the cons!

teej281

^THAT!

tbirdscwd

God, I can't wait to have 4.56s in my car. Give me some rpm already.

Z28KLR

I must be doing something wrong. I for the most part get just shy of 19mpg, occasionally as much as 21 if it's pure freeway, most of my traveling on the freeway is done at 80mph. Even with stock gears I don't recall getting much better than maybe 22mpg. The only time I ever got 25mpg, since I've had 4.10's, was a trip from Seattle to Portland (straight shot with no stops for about 200 mi) where I had the cc set at like 68mph because the state troopers in Washington are absolute hicks and ***** (really bad combination).

I'm not pissed about my mileage, in fact I could care less because it is not why I have this car, but I can't figure out how everybody seems to be getting so much better mileage than me. And in comparison, at least by the impressions I get from others on this board, I drive my car somewhat conservatively. It rarely sees any wot or 5K shifts. And yet a measly 18mpg city/hwy mix is all I see.

Anyone have any comments or insight on this?

teej281

Change your fuel filter and your thermostat. Your thermostat could be stuck open and not allowing your car to fully warm up and your fuel filter could be partially clogged or just not as free flowing as it should be. Taking care of this things could help you a lot. I changed my fuel filter at like 99k or something and I gained over 3mpg.

tbirdscwd

You will get considerably better mileage if you were to drop your freeway speed down to 65ish, but I realize that is not in the card for everyone. The faster you go, the more load is on your engine to overcome increased wind resistance. The more load on the engine, the more fuel is required. You saw this first hand when you set the cruise control to 68mph.


Slowing down it the best thing you can do to increase fuel economy. Laying off the throttle and seriously driving like a grandma is the only way to get good fuel economy around tow. Shifting at or below 2,000rpm (seriously) is gonna get you best results. If you have access to tuning software, you can set your AFR a bit leaner in order to gain a bit of MPG. A lot of custom tuners will offer "fuel economy" tunes which do just that.

This of course is assuming that you already have a properly working car. If your car is operating poorly due to clogged air/fuel filters and such, you aren't going to get good MPG no matter what you do.