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Old 06-08-2016
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Gas milage help

So I'm running 33/12.50r15s with 3.73 gearing (stock). In combination with the cruddy 4 speed auto I have been getting 12-13 mpg with 20% highway 80% city. Would going with 4.10s improve my fuel economy at all? Or is there anything else I can do to improve my fuel economy? I don't drive it like a jackass very often so I don't think that's the problem, I keep my foot out of it most of the time.
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Old 06-08-2016
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Welcome to the forum

With 33" tires and 3.73 axle your actual ratio is 3.16.

3.16 is good for highway speeds, keeps RPMs lower, but you will be using more fuel to get going from a stop so 80% city driving is whats dropping the MPG average.

Changing to 4.10 with 33" would give you an actual 3.48 ratio
Changing to 4.56 with 33" would give you an actual 3.87 ratio

4.56 would be closest to stock ratio and expected MPG from 3.0l Ranger
And you have to change both axle ratios since it is a 4x4

But at 12" wide you will lose MPG from tire friction, high MPG vehicles have skinny tires for that reason, less friction = better MPG.

You also have a pickup so aerodynamics of the brick, and I assumed raised up by the 33" tires so no benefit from ground effect.

You might be able to pick up 3 MPG with gear change.
Truck will also feel "peppier" with the higher gear, more low end power
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Old 06-08-2016
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Quote:
Originally Posted by RonD View Post
Welcome to the forum

With 33" tires and 3.73 axle your actual ratio is 3.16.

3.16 is good for highway speeds, keeps RPMs lower, but you will be using more fuel to get going from a stop so 80% city driving is whats dropping the MPG average.

Changing to 4.10 with 33" would give you an actual 3.48 ratio
Changing to 4.56 with 33" would give you an actual 3.87 ratio

4.56 would be closest to stock ratio and expected MPG from 3.0l Ranger
And you have to change both axle ratios since it is a 4x4

But at 12" wide you will lose MPG from tire friction, high MPG vehicles have skinny tires for that reason, less friction = better MPG.

You also have a pickup so aerodynamics of the brick, and I assumed raised up by the 33" tires so no benefit from ground effect.

You might be able to pick up 3 MPG with gear change.
Truck will also feel "peppier" with the higher gear, more low end power
I know the low ratio will make it have better mpg on the highway, but I have to get into it so much that I often can't even use overdrive because there isn't enough power lol. I understand the friction thing, it does suck having 12 wires sometimes but Damn they look mean. I'll most likely just regear it to hopefully get some of those mpgs back 👍
Thanks for your help.
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