How much does it cost YOU to fill up your tank?

I live in south Texas on the edge of Houston and my used to be $10 tank on my 2005 Toyota Matrix now takes almost $30 to fill. Although it appears Houston area is cheaper than some places further north, that is a big jump within a few months. I pity these people that have big tanks that are paying upwards to $125 and more on a regular basis. I work for a company that is oil field related (drilling materials mfg.) and when the gas goes up, the company's business does too. That's a shame...the regular person suffering means the business is up...