Energy crisis: How fast do you drive?

I was reading on-line about how to save a buck here and there, and one consistent finding concerned cars. Obviously we should always live within our means and avoid purchasing pricey vehicles (certainly because they traditionally are not an investment - simply because their worth rapidly depreciates) but also because the cost of gas and diesel (I drive a VW TDI) has become so expensive. I found this website to be interesting where they report driving over 60 mph (or speeding) can cost you on average .20 cents more per gallon! Well, I for one will now be a little less lead footed.