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Cold Fuel and Warm air
Another reason I think mileage improves in warmer weather is the fact that you are pumping relatively cold gas that then warms up in the tank and expands...
In other words you pumped in say 10 gallons of fuel that was at a temp of 50 degrees F. It is then heated up by the warmer air and presto 10 gallons slowly expands to say 11 gallons...
Also, Mopars (chrysler, dodge, plymouth) from pre FI days were known to pump a lot of heat into the manifold; there is a passage that allows hot exhaust gases to pass thru the manifold under the carb... and no I do not mean EGR. This is in addition to the warm air ducted into the carb during cold engine running. The heat in the manifold even caused a lot of hot start issues especially on the 60's and 70's era Mopars.
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