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Fuel quality?

2447 Views 2 Replies 2 Participants Last post by  Okeephe, 
M
I just bought my spark and on regular gas the computer tells me I am getting nearly 43 MPG at 55-65mph. Hand calculated it is pretty accurate. (90% HWY) However, my first tank was regular and I am wandering if medium or premium grade will effect MPG?
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M
No difference observed
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O
Yes, over the long term higher octane fuel will lower your mpg slightly. It also lowers your power slightly, which is why the mpg goes down.
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