What are possible causes of low gas mileage on a 91 318i? Fixed all vacuum leaks/mess under intake, new air filter, new plugs. Idles and pulls smooth. Tire pressure OK. Last fill, got 260 miles/13 gal =20mpg. Probably about 60/40 city/hwy. 20 miles commuting per day. Stock 4.10 open diff.
Any ideas on where to search first and get my mileage better? O2 sensor? Wires? (plugs are new) Thanks.
Any ideas on where to search first and get my mileage better? O2 sensor? Wires? (plugs are new) Thanks.
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