mpg question and than some

[BMWfreak]

Hi !
Recently at the gas station I calculated my average mpg and while 26 highway seems reasonable for my m20 525i on stick, the 19mpg I got in the city driving seems a little low !!!
Since I bought the car from a guy that didn't really care for it so I assume that o2 sensor could be faulty, but right now I don't really have the funds to replace it.
Would it help if I used some gas treatment/engine cleaning chemicals to improve my engine performance and economy ? What kind of stuff do you guys recommend to use in 174k miles m20 engine ??
Thanks,
Dan

[Warren N.CA]

BMW's product brochure states that EPA mileage for your car is 17 City and 23 highway. We are talking about a 14 or 15 year old car design without variable valve timing, here. I wonder upon what data you were basing your more lofty expectations.




Hi !
Recently at the gas station I calculated my average mpg and while 26 highway seems reasonable for my m20 525i on stick, the 19mpg I got in the city driving seems a little low !!!
Since I bought the car from a guy that didn't really care for it so I assume that o2 sensor could be faulty, but right now I don't really have the funds to replace it.
Would it help if I used some gas treatment/engine cleaning chemicals to improve my engine performance and economy ? What kind of stuff do you guys recommend to use in 174k miles m20 engine ??
Thanks,
Dan

[BMWfreak]

I remember reading somewhere on this forum (but maybe it was m50 525i) that someone was getting 21/28 mpg.
But if what you say is correct than I am above the factory data.
Oh, and actually the engine design is more like 20 years old !
Thanks,
Dan

[Bill R.]

The m50's were made to be more fuel efficient, quite a bit was done on improvement for gas mileage.






I remember reading somewhere on this forum (but maybe it was m50 525i) that someone was getting 21/28 mpg.
But if what you say is correct than I am above the factory data.
Oh, and actually the engine design is more like 20 years old !
Thanks,
Dan

[Tiger]

Ooh... same as my 540i?

[632 Regal]

wonder what the 530's supposed to get.

[Bill R.]

wonder what the 530's supposed to get.