gas milege with 3.73 vs 4.10 - Ford Mustang Forum
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post #1 of 15 (permalink) Old 11-18-2017 Thread Starter
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gas milege with 3.73 vs 4.10

I want to see what gas mileage everyone who has an auto is getting with either 3.73 or 4.10s before I buy my gears. I run about even on city and highway and I get 19-21. if I got 17- 18 I wouldn't be bothered really but with premium at almost 3 dollars a gallon here getting costly.


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post #2 of 15 (permalink) Old 11-18-2017
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IMO if you have even the least concern about gas mileage you should not do anything at all. Why? Because any gas saved is going to be small compared to the cost of gears.


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post #3 of 15 (permalink) Old 11-19-2017 Thread Starter
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true but at the same time im willing to let a little go its a mustang not a Honda lol

1997 Mustang Gt auto - White Rose - Custom 2in exhaust with headers and flowmasters and an offroad stock 2.25 in h pipe and custom bent 2.25 catback 3.08 rear end MM caster camber plates installed Kyb gr2s installed Ford racing c springs with polys isos all around SR performance upper and lower poly control arms pi head swap gt500 followers sr cold air intake hand ported stock plenum raxiom smoked halo headlights
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post #4 of 15 (permalink) Old 11-19-2017
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Manual transmission w/ 4.10's I average 17-18 mixed driving. On long trips, all freeway and averaging 80 mph fuel mileage goes up to 20-21.


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/1967 Coupe
All the usual bolt-on's /200 I6, C4

And a few Explorers too... 2008 4.0 XLT 4x2, 1996 XLT 5.0 4x2, 2003 Sport Trac XLT 4.0 4x4
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post #5 of 15 (permalink) Old 11-19-2017 Thread Starter
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hmm I'm still undecided when I go up to college it will be 90% city 10% highway

1997 Mustang Gt auto - White Rose - Custom 2in exhaust with headers and flowmasters and an offroad stock 2.25 in h pipe and custom bent 2.25 catback 3.08 rear end MM caster camber plates installed Kyb gr2s installed Ford racing c springs with polys isos all around SR performance upper and lower poly control arms pi head swap gt500 followers sr cold air intake hand ported stock plenum raxiom smoked halo headlights
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post #6 of 15 (permalink) Old 11-20-2017
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With 3.73's as a daily driver, mostly highway and cruising at a steady 80 mph, I was getting 23 mpg regularly. I Have a much different setup now than I did then and I havent even tuned in my afr yet but it still gets 18 mpg with the 4.10's. Im convinced I can get more.

My buddies car with 4.10 (both a 302 car and a 4.6L car) averaged 26mpg on the highway cruising around 80mph.

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post #7 of 15 (permalink) Old 11-20-2017
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My car gets 17-18mpg on the highway...full weight vert, wide ass wheels, 4.10s, cams, full exhaust, dyno tune on 93. Mine is a gas hog...

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post #8 of 15 (permalink) Old 11-20-2017 Thread Starter
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so I should go with the 4.10s or 3.73s I'm confused with what to go with and there is always 3.90s

1997 Mustang Gt auto - White Rose - Custom 2in exhaust with headers and flowmasters and an offroad stock 2.25 in h pipe and custom bent 2.25 catback 3.08 rear end MM caster camber plates installed Kyb gr2s installed Ford racing c springs with polys isos all around SR performance upper and lower poly control arms pi head swap gt500 followers sr cold air intake hand ported stock plenum raxiom smoked halo headlights
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post #9 of 15 (permalink) Old 11-20-2017
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List your top three priorities for the next five years on a piece of paper...you might find a gear change isn't needed to fulfill them.
But if you must...Automatic trans plus college...3.73.
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post #10 of 15 (permalink) Old 11-20-2017 Thread Starter
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I think ill do 4.10s depends how much cheaper I can get the gear sets

1997 Mustang Gt auto - White Rose - Custom 2in exhaust with headers and flowmasters and an offroad stock 2.25 in h pipe and custom bent 2.25 catback 3.08 rear end MM caster camber plates installed Kyb gr2s installed Ford racing c springs with polys isos all around SR performance upper and lower poly control arms pi head swap gt500 followers sr cold air intake hand ported stock plenum raxiom smoked halo headlights
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Your automatic transmission will run cooler and live longer with the higher gear (3.73) vs a lower gear. Especially with a lot of highway driving.

For someone concerned about the cost of gas, how does the cost of a transmission overhaul rate in the equation?

For an automatic application it's also VITAL that the PCM know the correct speed of the car. This will help the PCM to determine the correct shift points.

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post #12 of 15 (permalink) Old 11-23-2017 Thread Starter
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i plan on adding a transmission cooler and doing the jmod with it and ill end up doing the speed cal

1997 Mustang Gt auto - White Rose - Custom 2in exhaust with headers and flowmasters and an offroad stock 2.25 in h pipe and custom bent 2.25 catback 3.08 rear end MM caster camber plates installed Kyb gr2s installed Ford racing c springs with polys isos all around SR performance upper and lower poly control arms pi head swap gt500 followers sr cold air intake hand ported stock plenum raxiom smoked halo headlights
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Quote:
Originally Posted by SoCal2V View Post
Manual transmission w/ 4.10's I average 17-18 mixed driving. On long trips, all freeway and averaging 80 mph fuel mileage goes up to 20-21.
That's great! How many RPM are you turning at 70mph? I've had a set of 4:10's in the box for over a year and never installed them.

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Quote:
Originally Posted by msirach View Post
That's great! How many RPM are you turning at 70mph? I've had a set of 4:10's in the box for over a year and never installed them.
Wanna say at 70 mph she spins right around 2500. 80 mph is a more common cruising speed for me, for sure the tach sits right at 3000 at that speed.

If you go to PaladinMicro.com and click on "calculators" there is a gear calculator there that gives you the rpm/mph reference for each gear. Input your transmission, final drive ratio and tire size.
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2001 GT Convertible
/1967 Coupe
All the usual bolt-on's /200 I6, C4

And a few Explorers too... 2008 4.0 XLT 4x2, 1996 XLT 5.0 4x2, 2003 Sport Trac XLT 4.0 4x4
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With a 4r70w, 26” tall tire, 4.10 gear, I turn 2800 rpm at 70mph.

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