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**jonathan180iq** · 06-12-2008, 10:13 PM

I've kept track of gas mileage and fuel price for all of my vehicles for the last year a half. I've never put premium octane in the GZ because there is no need for it.
Between 90% fill ups on 87 and 10% on 89, I average between 64-70 miles per gallon. Highest being 74, lowest 61. Both high marks have come in warm weather. Low marks in winter. The 61 mark came from using 10% ethanol fuel.

06-12-2008, 10:13 PM	#7
jonathan180iq Super Moderator Join Date: Jan 2007 Location: Dalton, GA Posts: 3,995	I've kept track of gas mileage and fuel price for all of my vehicles for the last year a half. I've never put premium octane in the GZ because there is no need for it. Between 90% fill ups on 87 and 10% on 89, I average between 64-70 miles per gallon. Highest being 74, lowest 61. Both high marks have come in warm weather. Low marks in winter. The 61 mark came from using 10% ethanol fuel.
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