First Two Tanks of 2008

I have actually refueled twice this year and forgot to enter the first
tank's information until now.

Tank 1: 37.50 mpg
Tank 2: 37.55 mpg

This is interesting to me because this secon dtank I was driving much
faster than I normally do on my way home, at times hitting 75 miles per
hour in light traffic. I also did a fair amount of "in town" driving of
short distances, and had more than one hard acceleration opportunity.

I was expecting my fuel economy to suffer accordingly, but it did not
appear to.

So far in 2008, I have gone 764.5 miles on 20.373 gallons of gas, making
for an average fuel economy of 37.52 miles per gallon. This compared
favorably to the first two tanks of 2007, where fuel economy was about
36.65 mpg. However, at this point in 2007 I was not tracking air
temperature at fill-up time, but as you know, I don't believe in the
"hot gas" theory.

However, I do believe my fuel economy is lower when it's very cold or
very warm outside, due to the additional warm-up time needed in the
cold, and the use of air conditioning during warm weather.