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Oh yeah, I forget some people really do have winter! ON the Gulf Coast, 30-40 degrees IS winter! And, I forgot about choke time, you are correct! Stephen J. Jackson Commissioning Engineer, Petron Industries, Inc. SJackson@petronworld.com -----Original Message----- From: Jim Adney [mailto:jadney@vwtype3.org] Sent: Thursday, August 25, 2005 9:45 AM To: type3@vwtype3.org Subject: RE: Painting...and Gas Mileage... On 24 Aug 2005 at 23:15, Steve Jackson wrote: > Jim...one would think that cold winter air is more dense, therefore > increasing efficiency with better volumetric efficieny (effectively more > air less gas...). You're right, of course. But there's another thing coming into play at the same time. In cold weather, the warmup time is longer, with more time spent with extra-rich mixtures (either chokes or FI temp compensation), plus the fact that when the engine is extra cold the oil is thicker and extra energy is spent just turning bearings, etc. with extra thick oil in them. On a long trip in cold weather I find my gas mileage is just fine, as long as the tires don't have to push thru ice and snow, but in local traffic the engine may not even get warmed up to its normal operating temp, and fuel consumption will be excessive. If you're talking about riding your motorcycle in "cold" weather, I'm gonna guess that you mean 30-40F, which around here only qualifys as "brisk." Your engine is completely happy at those temps, and the warmup is not delayed all that much. I had a friend here who rode his motorcycle thru the winter, but the cold did in a bunch of his oil seals; they just weren't designed to work at -20F. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~