Yeah, I just got my evo and I thought I was going to get better gas mileage than my Land Rover. Does a hot climate have something to do with it too?

 

Yep. I pull near 24mpg on interstate trips with my AMS tuned.

 

I get 23-25mpg city/country/highway mix

Usually I am around 300+ miles a tank....

 

im starting to worry myself... i just got my car 2 weeks ago, and it seems like im getting less mileage then all of u guys... when i first drove it home it seemed like i was getting about 20mpg.... but now i actually tried getting good gas mileage... i was always shifting below 2500 rpms and not driving fast at all and i only got like 17 mpg.... i dont know whats wrong.... also i decided to drive it harder to see if it made a difference... and well i dont think it does... ive had about 5 wot runs shifting at around 5500-6500 and im still at about where i was for half tank.... any suggestions?

 

I usually get around 220-230 to a tank with mostly street driving. Got over around 260 once with lots of highway driving, which was nice. I'm bone stock. Will a good flash seriously help?

 

Don't worry, the gas mileage gets better when the car breaks in more. In my (first) IX, I averaged 20.77 mpg throughout 2006, completely stock, mostly daily driving.

Getting good gas mileage is the result of a lot of factors... outside temperature, load (is the A/C on, are you carrying a lot of passengers, is there a ton of junk in your trunk, etc.), acceleration, shifting (proper rpms in the proper situation), throttle position (proper throttle in the proper gear in the proper rpm), tire pressure, trips (one long freeway trip for 100 miles will get better mpg than ten long freeway trips over 150 miles, etc.)

 

ime doing 180miles for a full tank..for a normal driving with a drop-in air filter and greddy ti.. will do a tune afterwards. don't know if the tune helps with the gas mileage.

 

Nicely said ^

 

Thanks. Now that I think about it, the best mpg I got was 25.23, achieved when driving all freeway miles without traffic at night (yielding cooler outside temperatures and no need to run the A/C). My worst was 18.01, achieved when driving mostly in the city during the summer with the A/C running most of the time. And no, I don't drive like a madman, at least not for the entire tank. Only on the onramps.

 

im thinking maybe its because i live in vegas, and i have to run the a/c during the time i drive because it is already 100+ degrees here... im guessing that could be the problem... it makes sense because when i was in cali my gas mileage was significantly better and i was not running the A/C

 

Shape of the tank factors into that, my eclipse does the same thing.

Daaaaaammmmmmnnnnnnnnnnn I was excited as hell tonite that I made it 20 miles more before the gas light coming on than any other tank. My light came on at 275 miles tonite, most highway and the air on at least half of the miles, gotta get gas tomorrow and see how good my mileage was. Only difference with this tank was I don't think I ever went WOT. I'm excited to see how I did, well aside from having to fill up the evo and the eclipse with premium tomorrow. Let's see 25 gallons x 3.19/gal =

 

OK, so answer me this, since I know not a lot about gas mileage;

Why do I get better mileage shifting at 2500 rpm than at 2000 and cruising in the city in 4th at 2000rpm rather than 5th at 1500 rpm?

Is an RPM too low detrimental to gas mileage?

 

Yes, too low of an rpm in too high of a gear will put more load on the engine, making it work harder. Though the rpms might be lower, in both of those instances, you'll notice that you'll be pushing the throttle a bit more. More throttle = throttle butterfly open more = more airflow into the engine = more fuel.

Think of it this way... imagine pushing a shopping cart with a 30 pack of beer inside it at powerwalking speed, then imagine pushing a shopping cart with two kegs inside it at walking speed. Which do you think will be more strenuous on your body? Sometimes speed (or engine speed) isn't the biggest contributing factor.

 

I extended my closed loop range and leaned out the AFR in boost. I only bested 25.5 mpg but I drive like an *** all the time.

Its sad that my fast car (1g eclipse fwd) gets the best mileage of them both. It has gotten 35.5 going to the shootout and back.

 

So somewhere inbetween must be the tradeoff. If i'm cruising at 35 mph, where is the tradeoff between too high a gear pulling too many RPM and burning too much gas to too low a gear putting too much strain on the engine?