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So after searching around I couldn't find anything on this site related to gas mileage. So I went to google and found that the 280z is rated about 18mpg city and 27mpg highway! Well I'm running a mostly stock 280z (just intake and 2.5" straight exhaust) and I'll get 16-18mpg cruising 50% highway at 70mph @ ~3800RPMS, and most of the rest on country roads at 55mph @ 2500RPMS. I think the only other things affecting mileage would be wider sticky summer tires (225s) and a 3.7 rear diff, but would that really kill my mileage that much? I have new plugs and wires as well, and my car idles rock solid at 750rpms, but I don't have a wideband (yet) to check my AFRs Are other people getting similar mileage, or is my car running too rich for some reason?
