Just posted my worst MPG EVER!

[GeoffM]

My Fit went from about 38mpg to about 36mpg... though I may drive it harder now than I did previously (new brakes and tires, I'm a bit more confident than I was!) Cold weather does always seem to lower MPG, though I don't really know the reasoning behind that.

My CB7, with the H22 and a street-tuned P28 (done by MRX), got about 28mpg on average. I'd hit VTEC at least once a day, as well.

went from 33mpg down to 30.

These are manual, I'm assuming?

[deevergote]

Yes, all 3 of my cars are manual (and my Cadillac will be as well.) Automatic sucks!

[flcb7]

IMPO...cold air = more gas. The ECU has to compensate for the nice cold air with more fuel for the right combustion

[deevergote]

That's true. More usable oxygen (which is found in denser air, and cold air is denser than warm air) requires more fuel for a proper air:fuel ratio. You could probably tune an ECU to be more efficient in the cold, but with a stock tune, yeah... that makes sense.

[GeoffM]

Yes, all 3 of my cars are manual (and my Cadillac will be as well.) Automatic sucks!

Cadillac =

There's a different gas mixture for the winter/summer

[mtnbikaah]

hypermilers install "warm air kits" in the winter time to help improve their gas mileage. it also helps the car warm up faster (which uses a lot of gas in doing so, even when driving)

[deevergote]

My friend tried that hypermiling shit for a while... he was turning his car off at stop lights and everything.

I get 36mpg in the Fit... redlining 2nd and 3rd on the highway, heel-toe downshifting into most turns, and accelerating hard at stoplights (not launching, but not creeping along like grandpa either.) I could probably get 42 if I really babied it... but hey, I want to enjoy driving my car, dammit!

[Monza]

Good so it's not just me, It costs me almost $60 to fill my tank and I'm only getting about 450km to a tank right now. Make me feel a little better but still sucks

[92cb7h22a]

$60 dollars to fill up?? Wow where do you live. It only takes me $35-40 to fill up where i live

[SaiSofine]

That's true. More usable oxygen (which is found in denser air, and cold air is denser than warm air) requires more fuel for a proper air:fuel ratio. You could probably tune an ECU to be more efficient in the cold, but with a stock tune, yeah... that makes sense.

Exactly. And might i add that denser (colder( air needs a more concentrated spark, and a greater, denser amount of fuel charge to ignite the denser air. Therefore, your car is sucking more gas to ignite this denser air, and your gas MPG's go down.

[onelivinlarge]

that makes sense that u need more gas for denser air. i just dont see damn y its gotta go from 24-26 to 19 lol

[Monza]

$60 dollars to fill up?? Wow where do you live. It only takes me $35-40 to fill up where i live

I live just outside Toronto, Canada and right now we are paying $114.5 per liter

[GeoffM]

That's true. More usable oxygen (which is found in denser air, and cold air is denser than warm air) requires more fuel for a proper air:fuel ratio. You could probably tune an ECU to be more efficient in the cold, but with a stock tune, yeah... that makes sense.

My guess? Besides a smaller engine, the fit has 2 basemaps. One for cold, one for warm. I think a lot of newer cars are doing this, it would definitely explain my uncles sierra not seeing a drop in mileage.

Probably a sensor in the tank and ambient air temp to decide to run on the cold map.

[alb_accord]

it doesn't matter how the weather is cold or warm, the mpg shouldn't have that big of a difference.

i think i am pushing about 250-270mpg right now which sucks. mostly is high way miles. but at least i know what is wrong with my car. i have an exhaust leak between the header and the down pipe and because i have a dx model and running dc header, i had to extend the wires for the o2 sensor and stil using the old dx o2 sensor.

[Ferocious Cake]

i think i am pushing about 250-270mpg right now which sucks

What? That can't be right