Isflamez

WOW! now im pissed.

idoke1

iTrader: (5)

So far on my F, I am at a average of 17.9 mpg. Mostly city driving and some hwy.

dannyk8232

After a year and a half, I average about 19...mostly city driving.

PDP180180

iTrader: (3)

Not entirely sure?!

Having dyno'd the car alongside a couple of stock ISF's, and another modified one, my car was down on power, and had a nasty spike in my AFR readings.

I've since swapped it out for a K&N panel filter, and HPS intake pipe.

Same dyno showed an improvement in every respect.

Just my experience/2p worth.

Meraki Autoworks

iTrader: (8)

I get 14 bro.. mostly all city but If i do 60% highway, 40% city i'll get like 18. I have i/h/e so im constantly pounding on my car lol.

allst4risf

iTrader: (1)

really im only get 17 or 18mpg i havbe a 2012.and cali 90 city driving.

ISF4life

iTrader: (30)

Beast mode ! save the most gas lolz ahhahaha :P

BieberNutz

My regular commute is also ~60 round trip with a mix of city/highway. That said I avg about 16-18 depending on how I choose to drive that week. 18 if I'm in 'normal mode' and driving "conservatively" with the occasional spirited burst - bc how can you not in these cars. 15-16 if I'm mostly in normal mode with the occasional 'sport mode' excursions. I think the worst I've averaged in just over a year of ownership was 14 when I spent the better part of the tank in sport and driving like I stole it Either way fill-ups every 3-4 days is about normal I think.

Gymkata

IS250 mode will get you the best gas mileage

SaintLexus

iTrader: (4)

Sport Mode for me 23 mpg. Car, or the engine works less harder specially when you're going up on a hill as an example.
My average from SD to SF.... 21-22 per gallon. 23-24 per tank. If I can remember correctly.

Sean

iTrader: (3)

I checked mine yesterday and it said 17-18 for both average and tank average. That's with takeda intake, joe-z exhaust, ppe headers and pretty much 100% city driving. Not bad if you ask me.

Like I said, I never actually look at the "current mpg" since I'm sure it would kill any enjoyment I may be having. I'm also not sure how accurate the average and tank average numbers are. The best method would be to set a trip odometer when filling up, check the miles at next fill up, and calculate based on how much gas you put in. I've never looked into this with the ISF, but my experience with other cars was the the MPG numbers displayed weren't accurate.

lobuxracer

iTrader: (2)

None of the modes make any difference to gas mileage. Your right foot's activity determines gas mileage.

shyguyF

I also do this way all the time with all cars i owned. Manual calculation on gas mileage gives different results every time filling up gas.

Meraki Autoworks

iTrader: (8)

haha so true.

Diesel350

I'm getting 22 mpg overall and about 26 on the hwy