coming from Cummins diesels.. With the ever increasing gas prices, would freeing up the engine with an intake and exhaust net better gas mileage? Right now I am averaging 20-22 mpg but would like to see 25. I dont drive that crazy so don't tell me to lay off the go pedal... Just asking to see if and what engine mods can get better gas mileage if any.. I know freeing up the turbo diesels makes a difference, just dont know if it applies to the turbo 4G63... Thoughts, opinions ?

 

its pretty tough to do on a stock turbo but with a good tuner you can have them play with the AFRs and give you the mileage you want.

 

have a tuner lean the engine out to use less fuel

 

I think that as long as you are on the stock turbo your gas mileage is going to be disappointing. I know that on a good day I'm lucky to get 18 mpg overall.

Slap a T3 on there and stay off boost I'm sure you'll be able to hit 30 mpg no problem

 

A tune will improve gas mileage by a little. If you want the most mpg as you can squeeze you must upgrade the motor with higher compression pistons ! 10:5:1 or 11:1 And off course you need to get retuned when building the motor.

Some other things you can do that in theory should help are, weight reduction and especially if its from rotating mass. Example, AWD lighter 2 piece driveshaft etc...

 

I have a 2004 Dodge ram 3500 non-dually, I put an exhaust, an intake and the Edge CTS with attitude. I get around 25MPG (on average), and when I want to get less MPG and more power I have it at the touch of a button!

 

Yea, I had an 03' 2500 with similar mods I sold to get the Evo. I still have the 95' with an ole' school heavily modded 12V..

 

so the evo doesnt really get that great of gas milage does it

 

High quality ignition will help a litle bit on fuel economy, also sticking with stock sized wheels/tires with correct pressures help a lot. Im getting over 20mpg on the highway no problem on E85, but every ounce of my car has been optimized.

 

I do a lot of highway cruising and average 26mpg at best. I don't know if you have a boost gauge, but I have the MR gauge pack in my car. I try to keep the needle at 30 vacuum (forgot the units) since I've done logs before and that vacuum was what gave me the best gas mileage at 70mph (6spd trans btw). Anything other than steady state highway driving though absolutely kills gas mileage.

My car has a cone filter and full 3inch turboback for reference.

 

Take off cat and save gas. Get a fuel conservative tune.

 

As some people mentioned, a bigger turbo and a COP ignition can get you to 25 and a little past.

Bigger turbos don't spool till a little later in the rpm range so if you grandma drive you can stay completely out of boost.

The quicker spooling stock turbos give a slight amount of boost even at low engine speeds. That costs fuel economy.

This is the cheapest COP system I know of for the evo.
http://www.szabaga.com/store/usedcop.html