gaseous experiment

So, to relieve our country's dependence on foreign oil, I staged a little experiment: for a one tank's worth of gas, I * tried* to drive conservatively. No gratuitous speeding, no revving past 4K - you know, trying to pretend like I drive a Corolla.

Usually, I get 300 miles on a tank. During my experiment, I got 350. Is the difference gonna be enough to get me to slow down? I doubt it. OPEC members, rejoice!