I thought you were referring to mileage allowances. I see you mean this. If the trustee's default is to use the operating costs charted by the IRS on that page, make your case that it's not a reasonable standard in your case. I expect that [(miles I driver per month, backed up with documentation) x 55.5 cents per mile] would be decent evidence that a higher amount is appropriate. Even the IRS makes allowances ("If the amount claimed for Ownership Costs, Operating Costs or Public Transportation is more than the total allowed by the transportation standards, the taxpayer must provide documentation to substantiate those expenses are necessary living expenses.").

