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Hey all, I have a 1989 740 GL, 5 speed manual, with the 2.3 litre four popper. I have no idea what gas mileage I get. I use stp products regularly, and use the complete fuel system cleaner every 4,000 miles. I also added an oil treatment to help the oil since it gets more stress on account of it only being an inline 4. All I know, is that I fill it up every week, and I drive about 6 miles to work every day. I drive about 100 miles a week for work. Sometimes more if I go out. The trip odometer says about 230ish per fill-up. thanks in advance!!
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