10-12-2010, 01:25 PM
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#1
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Registered User
Join Date: Jan 2007
Location: Depends on the day of the week....
Posts: 1,400
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That is low. I can easily average 20MPG in mixed driving, and I'm not driving like grandma either.
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Boxster S
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10-12-2010, 01:34 PM
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#2
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Registered User
Join Date: Jul 2009
Location: Arlington Heights, IL
Posts: 1,561
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Find gas stations that sell 93 octane Pure Gas (no ethanol). My gas mileage improves at least 10%. Even 91 octane Pure Gas yields better results.
http://pure-gas.org/index.jsp?stateprov=IL
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10-12-2010, 02:03 PM
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#3
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Registered User
Join Date: Jun 2007
Location: Littleton, CO
Posts: 456
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I've also found non-ethanol blended gas can improve performance, but certainly not 10% in MPG. I've seen a couple HP and maybe a fraction of one MPG difference. I've also measured small timing differences.
disclaimer: this was all on my 1999.5 A4 turbo.
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"Of all the extreme sports I've ever participated in- windsurfing, kite boarding, wake boarding, tow-in surfing and snowboarding- skiing, for me, made everything else easy."
-Chuck Patterson
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10-12-2010, 02:27 PM
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#4
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Registered User
Join Date: Mar 2008
Location: Dallas, TX
Posts: 288
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I get around 16-17mpg, mostly city driving with a very heavy foot. I also have 18x10.5 wheels with 275 rubber, that doesn't help either
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2001 Boxster S
RUF front bumper, Techart side skirts, Gemballa rear bumper, PSS9s, Cargraphic 18" racing wheels, RUF exhaust, GT3 seats
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10-12-2010, 02:27 PM
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#5
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Registered User
Join Date: Jan 2010
Location: Redmond, Wa
Posts: 369
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I'm not lookiing to increase hp/mpg via better fuel or other means (well maybe in future) right now I'm concerned that I'm overlooking something that is not right and I want to get to the root cause 
Thanks
Sasha
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10-12-2010, 02:38 PM
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#6
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Registered User
Join Date: Mar 2008
Location: Dallas, TX
Posts: 288
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Are you running 18 or 19 inch wheels? This can sometimes throw off the mpg.
What exactly do you mean by backroad driving? Lots of turns and hills can also lower mpg very quickly.
If your engine is running smoothly and if your local mechanic/dealer says that everything checks out, then I wouldn't sweat. As I mentioned before my City/Hwy ratio is the same as yours and my mpg is also very similar
__________________
2001 Boxster S
RUF front bumper, Techart side skirts, Gemballa rear bumper, PSS9s, Cargraphic 18" racing wheels, RUF exhaust, GT3 seats
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10-12-2010, 02:59 PM
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#7
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Registered User
Join Date: Nov 2008
Location: Massachusetts
Posts: 4,810
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I've noticed that whenever I take some of my girlfriends for a ride, I experience a sharp decline in MPG.
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Don't worry … I've got the microfilm.
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10-13-2010, 12:56 PM
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#8
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Registered User
Join Date: Jul 2009
Location: Arlington Heights, IL
Posts: 1,561
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Quote:
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Originally Posted by Pat
I've also found non-ethanol blended gas can improve performance, but certainly not 10% in MPG. I've seen a couple HP and maybe a fraction of one MPG difference. I've also measured small timing differences.
disclaimer: this was all on my 1999.5 A4 turbo.
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In my 2006 Boxster S I easily go from 22-24 MGP to over 26 MPG.
In my 1997 911 (993) Turbo I easily go from 14-16 MPG to over 18 MPG.
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