The Internal Revenue Service, citing the drain that high gas prices are having on people's finances, said Monday it is raising the automobile mileage rate that businesses and others can claim.

The tax agency said the optional standard rate to calculate deductible operating costs for business vehicles will rise from 50.5 cents a mile to 58.5 cents for the final six months of 2008.

That rate also applies to businesses and others entitled to depreciation allowances that operate automobiles for charitable, medical or moving purposes.