<VV> Fuel mileage and the cold

[ScottyGrover at aol.com]

Pardon my apparent stupidity, but what caused the difference in  
aerodynamics?
 
Scotty from Hollyweird
 
In a message dated 2/19/2010 6:35:03 P.M. Pacific Standard Time,  
jvhroberts at aol.com writes:
 
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