thanks for tuning in. i just recently finished a 2.3 diy build 9.5:1 hks 264, gtx3076r, creeping boost up from 11 to 14 to 18. i plan on stopping at 25psi. tuning along the way. injectors are unknown but my ltft low range is around -1 and my wideband is spot on to my high octane fuel table. car drives great and pulls like an animal when im not blowing i/c pipes off. but...i'm only getting 14.5 mpg . now i am tuning and pulling on it pretty regular. is this about right or is something off. here is my tune. thanks guys

 

Not a clue.
If you ask me there are way to many variables to even compare fuel mileage from car to car. A stock car to another stock car, sure but once you start changing things comparing them is a mute point.

I just put gas in my car when the level is below half tank, never even considered what mileage I am getting.
If you want better mileage stay out of boost.

 

fair enough. i think that i don't have much transition afr. i get 14.7 or 11.3 not much in between. i also realize that you don't buy these for mileage. it would just be nicer to get 20 mpg on my daily commute.
thanks

 

you are in closed loop while cruising, so your fuel and timing maps aren't a factor. as for the other settings? i dunno, since i'm not to great at tuning.
i wouldn't imagine you would be too worried about MPG if you are building a 2.4L with a big turbo. you can't have your cake and eat it too

 

just did the math on a thruway trip from last night. 19.8 mpg. i guess constant pulling to dial my tune in is whats slaughtering my daily mpg. might give the lean cruise patch a try when i get my primary map sorted out. also on the above tune my transition and part throttle low boost is leaner than previous so i think i will dabble there for a bit.

 

which table are you planning to change to lean out your cruise AFR? if you are figuring your MPG with mixed driving, tuning pulls, etc then you gotta expect it to be low. when i'm at the track i average about 4-8mpg LOL

 

reading through the control closed loop with wideband thread. it's way easy to lean cruise with a subaru but not so much with a evo

 

correct. you would have to change your open/closed loop switch parameters, then (IIRC) tune a whole lot that would normally be handled by closed loop operation.

with the Subaru it was super easy, though mine drove horribly at anything more lean than 15:1.

 

I don't see a reason to not get decent (read: 24-25 mpg+ on highway) mileage whether it's a stock engine/turbo or a 2.4 with a big turbo; when you're just cruising the AFR is still 14.7 and loads are still low, and the engine uses a small amount of fuel regardless. If you're going WOT all the time, then yeah the bigger turbo setup will consume more fuel.

OP, if you're doing lots of pulls, that could be the reason. When you're done tuning and you drive the car more "normally" (assuming it's a dd), you should see it come back to normal.

Was that 19.8mpg mostly highway, or a mix of city and highway? I usually get about that mileage mixed during the summer. Speaking of which, your mileage will be worse during winter. I see a 3-4mpg drop on my car.

 

technically, the 2.4 is using more fuel at all times and the 2.0 isn't what i'd call efficient to begin with, so...
i was basically just making the point that we aren't going to get decent mileage. like ever LOL. stock or tuned, i think i'm only getting 21-23mpg or something like that (it's been a while since i checked).

 

if this is city driving with tuning & blasting going on, this is normal.....even for a stock 2.0L

just depends how much your on the gas & in boost....with your set-up, your going to be in boost a lot, so dont expect decent fuel economy....

now if your getting 14.5 mpg or 20mpg while 100% fwy driving, verify your afr gauge is correct.....now if your boosting while on the highway, your mpg's will suffer, solely because once your in boost, your throwing fuel at it..

on my 2.4 with R2 cams & hta-grn on 91octane, i get ~16mpg in city & ~26-28mpg on highway @ 85mph.

 

i'd kill for that. i'm a best of 23mpg at 70-75mph.

 

thanks for the input. yeah 14.5 pounding on it and close to 20 on the thruway. and the snows waist deep. wideband seems in line but its not exactly new. if any of you are familiar with ngk wideband the screen reads 14.55 for lambda of 1 so its a little bit of an oddball but i have tuned lots of turbo cars with it and its a good repeatable reliable device. so it sounds like i need to be more civil if i should expect higher mpgs

 

Unless otherwise specified, gas mileage numbers are specified for daily driving. Mixing pulls, tuning sessions, long idling sessions while you tweak your map, and stop-and-go city driving through snowy weather will destroy your fuel economy.

You should probably just forget about fuel economy until you're done tuning. Then start with a full tank and do some normal city or highway driving so you can actually measure your fuel economy.

 

The way I see it, with the 2.3/2.4 making more torque at the same rpm than a 2.0 due to the added displacement, it should cruise at lower load, thereby needing less fuel to maintain a speed than the 2.0 would.