Suppose the pizza delivery guy gets 25 mpg like my car. Therefore a $1 rise in fuel costs works out to 4 cents a mile. The IRS proposes raising the writeoff by 8 cent a mile.  Hidden subsidy or what?
I think we'd have to know more about their calculations.  Not that long ago gas was much cheaper.

The original 2005 IRS mileage rate (40.5 cents / mile) was calculated using prices as of September 2004, when it was rare to break $2.00; and also they probably aren't counting on 25 mpg.  The rate covers cars, pickups, and panel vans.

Just for kicks, here's the current gas and diesel analysis with comparison to last week, last year, by region, from the DOE.