I rode in a 820 miles for a fund raiser, can I claim the expenses i incured?

[georgesT]

Yes, you may claim the expense if you donated to an IRS qualified organization.

See IRS Qualified Charity List

You can deduct all of your out of pocket expenses as cash contributions as well as 14 cents per mile  for travelling by auto in the service of your qualified volunteer organization.

If you are taking the standard deduction, you cannot claim itemized expenses like charitable donation.

If your itemized expenses are more than the Standard deduction, then you can itemize and claim charitable contributions you made to qualified organizations(like churches, Goodwill, Salvation Army, etc). 

For more information, see Publication 526, Charitable Contributions 

 See the below answer to FAQ on where to enter your charity donation

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