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InfiniteDice · 08-18-2011, 08:14 PM

O2 sensor does next to nothing on long highway trips. I know this because I ran no o2 sensor for years and still had great gas mileage in my old 325e.

In town having no O2 sensor, or a malfunctioning one wastes more gas.

I'd say have the emissions tested, this should point out a problem if there is one with the engine/fuel-air mix.

On another note, when you stop driving, quickly walk around the car touching all the rims. If one rim seems hotter than the others you could have a siezed caliper. Also a dragging parking brake can cause some drag. I would also check your tire pressures.

08-18-2011, 08:14 PM	#6
InfiniteDice 12 Years with the E30 Join Date: Sep 2006 Location: St. Catharines Posts: 1,121 Car: 325i 1987	O2 sensor does next to nothing on long highway trips. I know this because I ran no o2 sensor for years and still had great gas mileage in my old 325e. In town having no O2 sensor, or a malfunctioning one wastes more gas. I'd say have the emissions tested, this should point out a problem if there is one with the engine/fuel-air mix. On another note, when you stop driving, quickly walk around the car touching all the rims. If one rim seems hotter than the others you could have a siezed caliper. Also a dragging parking brake can cause some drag. I would also check your tire pressures. __________________ Performance one step at a time. Last edited by InfiniteDice; 08-18-2011 at 08:27 PM.