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Actually, it depends on the opportunity cost of the money between fill-ups. If you could increase the value of the money you didn't use to fill up completely over the amount of the increase in fuel prices in the interim.
Say, instead of paying $40 to fill up once a month, you only put $10 in every week. Gas prices during May increased an average of about 2.6% per week. If you took the $30 you didn't spend on gas in week one and invest it where the rate of return was greater than 2.6% and do the same each week, you'd actually end up ahead.
The hard part would be finding somewhere to invest where you'd get better than 2.6%.
Beancounters Rock!
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