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Old 08-17-2011, 10:35 PM   #1
2nd Gear Member
Discostar's Avatar
Join Date: Jan 2011
Location: Markham, Ontario
Posts: 215
Why is my fuel economy so bad?

I own a 1992 325is non-vanos motor. I read about people getting well over 500k per tank on these things, yet somehow I just barely break the 500k mark on fumes with super conservative driving.

I replaced my spark plugs, fuel filter, air filter. Nothing made an impact.

I am planning on cleaning the idle sensor soon. I hear that the O2 sensor has a big impact. Please don’t tell me about driving style, I know that’s a major factor. I only get 400km/per tank average with normal driving.

How is there such a big discrepancy between cars and fuel mileage? Could compression be playing a factor? Anyone else experience this issue?

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