Quote:
Originally Posted by burtandnancy
Accidentely put 6.5 gallons of 87 in last week and noticed absolutely NO difference in performance, no knocks, nothing. I'm sure the EFI adjusted everything and I plan on going back to premium as soon as I get down a few bars. Lots of scare threads on using 87 over the past year or so...
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I've put 87 in before as an experiment. Your fuel mileage will be lower, but not much. Maybe 2-4 mpg. If you work the engine hard it will get hotter than if you use 91 or better octane, because the computer will change the timing to prevent pre-ignition. Which is also why the mpgs are lower.
IMHO if you are just driving around town and not pushing the 1000cc engine too hard 87 is fine. Any other driving especially with AC use, should have 91 or better.