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First of all, if you are required to travel for work then your employer really needs to compensate you $ for $ for your expenses as a reimbursement, if they do you will get back 100% of what you spent.
Any deductions that you claim in a tax return you will only get back at your nominal tax rate.
If you also don't receive a "Travel Allowance" from your employer then you are required to keep all receipts for anything claimed.
You can not claim the maximum allowance.
Having a letter from your employer stating this travel was work-related will also help.