One of the reasons my friend bought a 4 cyln car was to save a lot more gas then driving his lincoln which burned a lot of miles per gallon.

Never let the boost kick in so it can save on gas but it seems that it wastes a lot more fuel then it should be using.

Oxygen sensor is fine too.

:00000732:

Maybe its just too early but I'm a little confused as to what exactly it is you are asking. how to increase mpg? driveability issues? your mpg is too low?

To help more thoroughly we need much more detail. what is your current mpg? what mods? any tuning or data logging devices?

Right now the engine is stock with the normal basic mods (cold air intake, greddy BoV, 3" catback, ect) with stock internals.

I think my MPG is too low. How many I get I don't exactly know, but I filled it up 2 days ago and drove about 45 miles in total and my tank is a bit under a quater from full already.

Also a bit off topic, but when I release the clutch just a bit, the whole engine bay feels like it shakes to hell. The motor mounts are on tight too, and I have a exhaust leak but I think thats due to no intake or I think its manifold) gasket.

Either way the MPG is really bad. I'm going to replace the oxygen sensor this Friday because the engine light DID come on for it before but it went away after a couple hours (and no I didn't delete the code).

Site says I should be getting like 21+ MPG city and 26+ HWY and again, I don't use the turbo much lol (how bad does the turbo effect it anyway? is it real huge?)

actually, if you are focused on trying NOT to let the turbo boost at all you might be killing your gas mileage just because of that. smooth pedal operation is best,, so if the car boosts going up hill or accelerating that's perfectly fine because that's how it is set up from the factory.

is the BOV recirculated? if not that can kill gas mileage too

It's not, I have it venting off to the outside because I really like it like that. The tube kills the noise :(

:laughing: well you have 2 options then. buy more gas or put the tube back on

Alright guess I'll have to buy one. Is there a specific one I can buy that won't kill the sneezing sound too much?

Also, whats the reason for it killing my milage? (I'm just curious)

the sensor on the end of your intake (MAF - mass air flow) meters how much air goes in and adjusts the fuel map accordingly. The BOV is after the MAF so when the air gets vented the MAF has already told the ECU that the air is in there and the other sensors are saying, "no it's not" so the ECU gets confused and scared because it thinks there is a problem. When that happens the ECU adds more fuel to protect itself because it knows that being rich won't hurt as bad as being lean. The result is poor performance due to too much fuel, and bad gas mileage. Think of it as a sporadic boost leak and it becomes more clear :thumbsup:

when the BOV is recirculated all systems are happy because the metered air is vented back into the intake system.

do you still have the stock one? does your intake even accept the recirc hose?

my friend doesn't have the stock one

all you need is a piece of bent tube to route the BOV to the intake. if you don't still have the stock one pretty much anything will work

Christ, what is your actual MPG? You need to figure it out because the gauge blows.

Theres nothing to actually tell me my MPG. So how would I find out?

fill the tank full and reset the trip odometer or write down your mileage. The next time you fill up watch how many gallons you put in the tank. Divide the number of miles you went since the last fill up by the number of gallons you put in the tank.

I'm doing a write up this is insane. WHP atleast your not ignorant like every other schmuck on here when it comes to MPG.

Fill up reset miles. drive to empty, fill up.

take miles driven, divide it by gallons used to fill up and you have your MPG


if you forget which one to divide by just say out loud.


Miles per gallon. per means divide by.

No wonder I've been burning up so much gas! I always wondered why that little needle went down so quick lol. It burns almost more then my V8 Lincoln. ;s

Any idea where I can buy the return hose? Ebay or my local mitsu dealer doesn't have it.

If you are trying NOT to spool the turbo and you shift at really low rpms, then gas in in the lower power range to accel you will obviously loose lots of gas. Manual says shifting right around 3k rpm is the most fuel efficient way to drive it. Its OK to spool the turbo a little :D