I'm not sure how it is in Mass but I called the department of safety (road toll bureau) in NH and they sent me some forms to fill out.They say you have 2 years to send in form for rebate 0.18 per gallon consumed off public ways. I fuel up at Hampton state pier and they gave me a separate slip with gallons and price per gallon. I imagine Mass has the same bureau so give them a call.
Good luck
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