<VV> Fuel mileage and the cold

[jvhroberts at aol.com]

 My 2005 Subaru Legacy GT has an instantaneous as well as average gas mileage feature. This has a turbo intercooled engine. On the same road that I drive a few times a week (flat, no turns, no intersections), in the summer, it's instantaneous MPG at 65 is 29. In winter, its instantaneous MPG is 25. Worked through the air density and viscosity equations for aerodynamic drag, and that accounted for ALL the difference. It really doesn't seem to be an engine issue, it's an aerodynamics issue. 

 

John Roberts
 

 

-----Original Message-----
From: Bruce Schug <bwschug at att.net>
To: virtual Vairs <VirtualVairs at corvair.org>
Sent: Fri, Feb 19, 2010 11:01 am
Subject: Re: <VV> Fuel mileage and the cold



On Feb 19, 2010, at 10:55 AM, Mike Jacobi wrote:

> Hey Cap'n
>
> I think cold weather helps gas mileage...but I could be wrong, it's  
> been a
> long time since physics class.
>
> Could be you're feeding in more gas because of spring fever.  Trying  
> to
> catch up with some warmer weather?
>



I don't think so.  Running on the chokes kills mileage (chokes richens  
the mixture like crazy).  This is true of any car, new computer  
controlled or old Corvair with thermostatically controlled chokes.

Further, once warmed up, the cold air results in a denser charge,  
great for power, not so great for mileage.


Bruce

Bruce W. Schug
CORSA South Carolina
CORSA member since 1980
Performance Corvair Group
Stock Corvair Group
VirtualVairs
FastVairs
'67 Monza, "67AC140"
bwschug at att.net








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