temp-mpg relationship

[Huw Powell]

my coupe routinely loses about 15% in "winter"

theory #1: the winter gas, the oxygenated stuff, doesn't work as well
theory #2: much more time spent in rich mixture mode while the engine
warms up.

the 90Q seems to be showing a little of the same, but the data are not
conclusive yet.

> At the risk of starting a Thread From Hell, would any of our more
> tech-oriented listers like to take a whack at why, as temperatures rise in
> the late winter into the early spring (in the Northeast U.S., in this case), gas mileage improves? 

-- 
Huw Powell

http://www.humanspeakers.com/audi/

http://www.humanthoughts.org/