Just posted my worst MPG EVER!

[The_Head]

What? That can't be right

miles per tank is my guess. 250-270 miles per tank is low 20 mpg I think.

[ambientwater]

i always do above 300mpg in winter and summer just depends how hard i am on it bu the lowest iv'e gotten was 200mpg when my car was stuck in 2nd

[daovangphotos]

I got 130 miles out of a full tank. Hows that for bad mileage?

I tweaked my timing (because it was too advanced) and now im at 140 miles at half tank.

Hopefully that helps you guys out a bit.

Advance timing = more air
more air = ecu compensates by sending more fuel
more fuel = bad mpg

its all based on what the 02 sensor detects in the exhaust and the ecu changes to compensate to correct it.


If it helps, i have an euro-r h22 with P0F ECU mated with the f22 auto tranny and f22 TCU

[mndude07]

Colder air is more dense, but a cooler intake charge also can lower the adiabatic flame temperature...basically less thermal efficiency.

[onelivinlarge]

I got 130 miles out of a full tank. Hows that for bad mileage?

I tweaked my timing (because it was too advanced) and now im at 140 miles at half tank.

Hopefully that helps you guys out a bit.

Advance timing = more air
more air = ecu compensates by sending more fuel
more fuel = bad mpg

its all based on what the 02 sensor detects in the exhaust and the ecu changes to compensate to correct it.


If it helps, i have an euro-r h22 with P0F ECU mated with the f22 auto tranny and f22 TCU

i wonder if this means my 02 sensor is was bad when i did my exhaust and now that my exhaust is fix and not leaking tht the o2 is messed up

[Flyingsheep]

I've been getting 28mpg average this whole winter season in my CB7. Something like 30% highway and the rest is city. My gas light always turns on at just about 400 miles. I'm surprised everyone else is getting low 20s.

Maybe because I'm driving a 5-speed

[UnderPaidSlave]

I average 300-360, guess I'm not doing as bad as I thought.

[NVmyCB7]

i was getting 14.2 GPM timing was way off after duing timing belt. finaly decide to fix and am now getting 23.7 GPM which is not bad buti can get more.i know i can

[BBCorvette18Pun]

I just got 25mpg out of a wagon and I flogged it a few times, let it Idle for a hour or so a few times. I'm stoked about my new DD

[pedalpusher90]

ha you guys are lucky I am getting 21mpg and one gallon of oil is lost and burned every 240 miles

[NVmyCB7]

ha you guys are lucky I am getting 21mpg and one gallon of oil is lost and burned every 240 miles

f22 are notorious for burning oil. get a oil catch can. everytime i change my oil i get about 4-5 ounces in my oil catch that would have ended up in the intake mani, injectors, valves, chamber. and thats after 2,500

[GeoffM]

f22 are notorious for burning oil. get a oil catch can. everytime i change my oil i get about 4-5 ounces in my oil catch that would have ended up in the intake mani, injectors, valves, chamber. and thats after 2,500

What? Mine burns so little it doesn't make a difference. I'm at 5k since I changed my oil. Haven't added a single drop, and I'm halfway between the lines.

What's an oil catch can? I just replaced my seals and the leaking stopped.

Everybody: Please post only ways for better mileage. There's a thread in off topic to post your mileage.

[NVmyCB7]

What's an oil catch can?

An oil catch can is a can inbetween the pcv valve and the intake manifold. it catches all the burnt oil fumes instead of directing them back to the cumbustion chaber to be burned off.



il take a pic of mine tomorrow

[GeoffM]

Doesn't the entire use of a catch can mean your PCV valve is not working?

[92exa6]

Doesn't the entire use of a catch can mean your PCV valve is not working?

PCV valve does not control oil. It has no way to know if the air moving through it contains oil. That's where a catch can, or (as the case with our cars) a set of internal baffles before the valve is employed to regulate the oil. On a boosted car the stock baffles can't always deal with the added volume moving through the system, thus a catch can is used to keep oil out of the intake. FWIW a catch can is most relevant for racing to keep fluids from making their way to the track surface.