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Old 08-10-2013, 01:34 PM   #24 (permalink)
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Join Date: May 2012
Location: Illinois
Posts: 29

Second time's the charm - '04 Honda Accord EX
90 day: 24.26 mpg (US)

Tengu - '11 Mazda Mazdaspeed 3 sport
90 day: 19.73 mpg (US)
Thanks: 5
Thanked 4 Times in 1 Post
Originally Posted by Lbar View Post

The car is built to run on premium, it's a forced induction performance car. If you ad 87 it will knock, even if you don't hear it, and pull timing. The computer will add the timing back in, causing knock again then pull timing. It will continually do this because the ecu doesn't know you put crap gas in it.
So you think the car can't even handle a few tanks on regular and midgrade I don't believe that for a second. I am not saying they switch to lower grades for good, I just want to see how much the fuel effects economy.

If they didn't want to do that, I would totally understand.
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