Thread: Lift and MPG's
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Old 05-06-2013, 06:20 PM
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brandonjansen brandonjansen is offline
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Join Date: Feb 2013
Location: Abbotsford, BC, Canada
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Vehicle: 2012 Dodge Ram 3500 CCSB 4x4
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Quote:
Originally Posted by Driver72 View Post
I'm not a fan of 6" lifts unless you really need them.
Too me, they look to high.
I like 3-4" lifts. Same goes with tires. If they seem "monster" truck sized, but you
never go in deep mud, sand, etc, it seems ridiculous.
I'd go no larger than 35's on tires.
I'd definitely argue the other way on that. In no way will only a 6" lift ever look to high on a full size truck. If you start getting into Bilsteins and body lifts on top of that then yes you can get pretty high (some might argue too high).

If you're going to spend the money on a suspension lift you're going to want a 6" for sure. It's only $150 more than a 4" and you'll end up regretting it if you don't go for the full 6". Check out Rough Country's lift kits. They are a very good price for what you are getting. Contact either Jeremiah or Andrew and Discount Auto Performance

Andrew: fastNugly@discountautoperformance
Jeremiah: jhinkle1989@discountautoperformance

Quote:
Originally Posted by Driver72 View Post
As for MPG, give your truck a thousand miles or so to break in.
Do you have the 3.92 gears? If so, that's part of the reason your mileage will be lower.
Clearly if you wanted the best MPG's the 3.21's are the way to go.
Definitely not true. The type of gearing you want for better fuel mileage depends on where you're driving and what other mods you are doing such as bigger tires. If you're staying with stock tires and doing mainly highway driving then yes you could argue that 3.21's will give you better fuel economy. If you are doing mainly city driving or adding bigger tires (or both) 3.92's are a WAY better option. 4.10's or 4.56's would be even better if they were an option.

Quote:
Originally Posted by Driver72 View Post
As for intake and exhaust combos increasing gas mileage.
Well I have never owned a Ram Hemi, but I've owned a lot of other cars and many of them I have modded with tunes, intakes, etc.

The idea of a CAI is to let more air into the engine.
With more air comes the need for more fuel.
Together they produce more power, and that extra power is not free, it comes at the expense of WORSE gas mileage, not better.

Exhaust is a different story.
I have never really done anything other than an axle back for better sound and a TINY bit better flow, but it's never been an item I'd consider to get better gas mileage from.
Again, not entirely true. The idea of adding a CAI and exhaust is too let your engine breath better and not work as hard to suck the air in and push it out. The CAI's on these trucks from the factory aren't bad so by just changing that, no you aren't going to notice any real gains. If you go to something such as a Vararam then you'll notice some power and torque gains and maybe a little bit better fuel economy. Maybe 0.5 MPG

The exhaust on the other hand is very restrictive. By changing the muffler and Y-pipe it will flow a lot better and you might see a few gains. But again, no more than 1 MPG....

Quote:
Originally Posted by Driver72 View Post
So you know, lifting your truck and putting bigger tires on it will only hurt your gas mileage too, especially at freeway speeds.
Once again, not entirely true. Yes, obviously you are going to lose fuel economy but lifting and putting bigger wheels and tires on. But you'll see more of a drop in city driving than highway driving. Simply because it takes so much more fuel to get those big tires turning again once you've stopped. At least on the highway you're generally at a constant speed. So yes it takes more fuel to keep them turning and you have worse aerodynamics but at least you aren't constantly trying to accelerate.

Quote:
Originally Posted by Driver72 View Post
If MPG is your concern, you'd want to lower the truck a bit and go with lighter wheels and tires. But doubt that's what you want on a 4 x 4
Exactly.... please don't lower your 4x4

The best way to gain back some MPG with a lift and bigger tires is 1) a tuner and 2) changing the gears. If you're going with 37" tires (even 35's) I'd go with 4.56 gears. They'll definitely help you out with fuel economy and make the truck feel closer to how it did with the stock wheels and tires.
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