Supercharger and mpg

[OneSickM]

I am getting a horrible gas mileage with my Supercharged ESS 625 M3 and wanted to check with others how many mpg they are getting. I am getting roughly 100 to 120 miles with full tank. Is this the normal average people getting when they are supercharged?

This is not a complain but rather a questionnaire. Obviously if I am complaining about mpg then I should not own this car.

[tom @ eas]

Originally Posted by OneSickM

I am getting a horrible gas mileage with my Supercharged ESS 625 M3 and wanted to check with others how many mpg they are getting. I am getting roughly 100 to 120 miles with full tank. Is this the normal average people getting when they are supercharged?

This is not a complain but rather than a questionnaire. Obviously if I am complaining about mpg then I should not own this car.

No different. Depends on disciplined your right foot is.

Look into when plugs/O2s have been changed last if mileage is a concern, we recommend changing plugs every 10K on supercharged.

[nycplumber]

How much is highway? Either way that's pretty low, roughly 7mpg. I will average that when I'm driving all city and basically red light racing.

[dgoldenz]

My gas gauge moves to the left about every 3.6 seconds

[Patrón]

Drove mine as a daily for 11k miles and almost always got 12-14 mpg. If I harassed it, I would get 10.

[eatsleepboost]

I get 14mpg usually. That's with just a couple pulls and mixed highway and city driving. I did not notice any significant difference in fuel economy overall when I put the charger on. I'm 6mt btw.

Sounds to me like you have an issue or your right food is made of lead.

[wfdeacon88]

Originally Posted by eatsleepboost

I get 14mpg usually. That's with just a couple pulls and mixed highway and city driving. I did not notice any significant difference in fuel economy overall when I put the charger on. I'm 6mt btw.

Sounds to me like you have an issue or your right food is made of lead.

Damn, 14mpg before the SC? I'm getting 18.5 mpg somehow stock

[SVH]

Really, it all depends on how you drive. If your really aggressive you'll get 8 mpg. Driving on the highway and baby the car and you can easily get 18 mpg.

[Mvy]

More info needed from OP on driving style. I can make mine get 2 mpg if I floor it all the time. If you believe the on board computer I average 12 city and 18 hw when I drive like the kids are in the car. I tend to get about 200-250 miles per tank. Before the SC, I would hit 250 consistently before needing to fill up.

[eternallx]

straight highway on a roadtrip I can do 15mpg on the Harrop Supercharger, but my usual everyday highway/city mix is 13.5mpg

[OneSickM]

Originally Posted by Mvy

More info needed from OP on driving style. I can make mine get 2 mpg if I floor it all the time. If you believe the on board computer I average 12 city and 18 hw when I drive like the kids are in the car. I tend to get about 200-250 miles per tank. Before the SC, I would hit 250 consistently before needing to fill up.

My driving style hasn't changed the day I supercharged my car. I was getting 200 to 220 miles on a full tank but now I am almost losing 1/2 of that which doesn't match the information I got that it should be close to stock

I have a light feet compared to other M3 owners. I do floor the gas paddle once in awhile but I don't redline it ever single time.

[Biirdman50]

Don't really pay attention. All I know is when M button is on with or without sc, gas mileage is terrible!

[Mvy]

Originally Posted by OneSickM

My driving style hasn't changed the day I supercharged my car. I was getting 200 to 220 miles on a full tank but now I am almost losing 1/2 of that which doesn't match the information I got that it should be close to stock

I have a light feet compared to other M3 owners. I do floor the gas paddle once in awhile but I don't redline it ever single time.

Somethings not right then! Did you check your AFR and other things like boost after the install? You must be running really rich to cause that much fuel burn, or maybe a leak somewhere but suspect you would smell fuel.

[eatsleepboost]

Originally Posted by wfdeacon88

Damn, 14mpg before the SC? I'm getting 18.5 mpg somehow stock

I should have stated that I have the ESS 625 kit as well.

[WayneM3]

I'm with the OP on this. I have the Evolve S/C kit and get terrible mileage too. My commute is mostly in NYC and there is traffic involved so 8-10 MPG and on the highway when taking it easy I still only get 15-16 MPG tops. My wife drove it on a long drive recently and got slightly higher but still pretty bad. I have new O2 sensors and that made no difference and not too much mileage on the plugs.

[eatsleepboost]

As mvy stated, what is your afr at during idle, cruise, and WOT?

[OneSickM]

Originally Posted by eatsleepboost

As mvy stated, what is your afr at during idle, cruise, and WOT?

AFR during Idle and cruising ~ 175, wot 185

[Spun Crankhub]

Seems a bit out of range unless you are really beating her up. I absolutely have more lead in my right foot than most, and I get over 200 on my 620.

[Iyzmi]

I consistently average 17-18mpg with my ESS 625 kit. Roughly the same as what I was getting stock. I fill up after 220 miles which is usually about 3/4 tank, ~12gal.