My M30 uses 20.5L/100km (11.5 miles a gallon)

[bill g]

I know this is basic but make sure you are not driving around with handbrake partly on or brakes binding, or with big load on board eg. several bags of cement in boot, mother-in-law (sorry, old gag).
Also that fuel consumption would not be bad if all your driving is in ridiculously busy stop start traffic where you spend a lot of time idling.

Bill G Melbourne Aus

[F4Phantom]

Just did a crash course in O2 lamda sensors and I had no idea of the large range of effects it has on the car. I kind of thought it was a bit like early carbon emissions canisters - dont do much, but was a good idea at the time. I will call BMW monday to ask about prices and compare with the online bmw place.

[F4Phantom]

I know this is basic but make sure you are not driving around with handbrake partly on or brakes binding, or with big load on board eg. several bags of cement in boot, mother-in-law (sorry, old gag).
Also that fuel consumption would not be bad if all your driving is in ridiculously busy stop start traffic where you spend a lot of time idling.

Bill G Melbourne Aus

Nah I am really careful with the basics like that. The car gets driven very easy and although does have a couple of kids in the back I am not sure this would account for nearly half the economy of others here.

BTW does this engine had 2x sensors, one before the C-Converter and one after? or is it just the simple procedure of replacing this

Oxygen Sensor
C5010-33552
In Stock Bosch (OEM) $189.00 $113.13

Thanks again.

[sKilled]

I am also a bit of a technical noob, but would cleaning the MAF help? Also, the lambda sensor would cause major havoc as I have heard this on many occasions in regards to other vehicles. Another consideration would be to check the octane rating of your fuel - use 95 or greater, 98 being optimal as any less would greatly increase you consumption. Do you tank an ethanol mix? They are also not as efficient apparently. Also worth considering/investigating.

[BigKriss]

I regulary get 17+ litres per 100kms for city driving. Its not that bad. Maybe consider a wideband 02 sensor.

[Dave M]

and if you want to experiment, adding 3oz of acetone per 10 gallons of gas changes the surface tension of the gas without altering the octane rating, allowing the gas to vaporize better, and therefore less of it needed to produce the same amount of power.

and yes i have actually tested it myself, my gas mileage went up 16%

Could you please enlighten us further on the hows and whats. Potential drawbacks?

Dave M

[Dave M]

OK, found some info on acetone. Mythbusters?

An excerpt for Winfred if he's considering it for the Dodge.

A tiny bit of acetone in diesel fuel can stop the black smoke when the rack is all the way at full throttle. You will notice that the exhaust soot will be greatly reduced and your truck or car runs smoother.

Guess you can't have your cake and eat it too

Dave M

[Bellicose Right Winger]

Mine was off by 8%. I use a 920 correction factor in the OBC.

Paul Shovestul

The OBC shouldnt be off by more than a few percent...

[Derek A.]

I get 17 city 21 highway ( 80+mph). Gotta remember these is an older engine design. Its like a tractor engine with fuel injection !

[Gayle]

I regulary get 17+ litres per 100kms for city driving. Its not that bad. Maybe consider a wideband 02 sensor.

What is a wideband 02 sensor?

And what are you doing posting during your meet? You are supposed to be buzy drinking beer, eating barbeque, and swapping stories.