As gas prices continue to skyrocket, are you filling your tank more often in an attempt to save a few bucks (i.e., buy a few gallons today so as not to pay a higher price for more gallons tomorrow)?

Case in point: Last Friday morning a local station was offereing regular gas for $2.799/gal. My tank was full, but I knew the wife's was only about 1/2 full, so when she came home from work at noon we went over there to fill up. In the intervening 90 minutes, the price had increased to $2.869! So instead we filled up a for $.03 less a few blocks away.