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I am participating as a volunteer in a medical study at Mayo Clinic. My mileage traveling there for the study is deductible as a charitable contribution. My vehicle computer calculates its gas mileage, which is about 10.4 miles per gallon. If gas is $2.20 a gallon each time I travel out there for the study (50 miles round trip over each time the next four years) can I deduct 21 cents per mile instead of 14? Is that how the "actual expense" deduction works?

Also, I have looked through the IRS site, and I know I can't deduct my time or blood or other "stuff" I donate as part of the study, but are there any special deductions, rules or tax breaks for participating in a study that advances medical science at no personal benefit and at rather great personal inconvenience for the participant?
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