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Jim...one would think that cold winter air is more dense, therefore increasing efficiency with better volumetric efficieny (effectively more air less gas...). This was definitely the case when I used to have a 2-stroke Kawasaki 500 in the cold months in Las Vegas it ran much more strongly than in more mild weather. Of course, this could also be mixture-related! Stephen J. Jackson Commissioning Engineer, Petron Industries, Inc. SJackson@petronworld.com -----Original Message----- From: Jim Adney [mailto:jadney@vwtype3.org] Sent: Monday, August 22, 2005 2:19 PM To: type3@vwtype3.org Subject: Re: Painting...and Gas Mileage... On 22 Aug 2005 at 10:16, J. Jonik wrote: > "Keith Park" <topnotch@nycap.rr.com> wrote: > > > Ive found recently that modern Gas, here in the US > anyway, it very problematic and wont give you the gas > milage you used to get... especially the winter > blends....... > > ****** Is there any info out there about this > possibility? With the gas price story, this would be a > quite newsworthy scandal. I don't think there's really any scandal here. It's all pretty much out in the open, although not much in the public awareness. Alcohol has less energy content than gasoline, so gasohol gives less mileage than gasoline. I suspect that some of the special blends mandated by the EPA for certain geographical areas also have the similar effects. Then there are summer and winter blends, with different levels of volatility. I think that longer chain hydrocarbons generally carry more energy, so the summer blends (lower volatility) should give better gas mileage. So winter brings us a double whammy with cold temps (which reduce our efficiency) plus gas with slightly less energy content. To some extent, the higher energy content in summer gas may be partly responsible for the higher summer prices, but higher summer demand is probably the main contributor. -- Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~