Michael Rigby-Jones wrote:

>Cold air is denser, so more fuel gets injected (assuming injected engined rather than carbs), hence more power in cold weather!  However, it shouldn't make it use more fuel unless you take advantage of the extra power...
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I was wondering about this, too.  As a boy I remember sitting on the 
(diesel) tractor plowing ground.  The tractor would pull noticeably 
better after the sun went down and the temperature dropped.  Of course 
this was a 1968 model-year tractor; not too much in the way of 
electronics on that one!

Aaron
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