Can we reopen discussion on this thread? Since I'm not in the USA, could you enable the idea of emailing, from a specific address, (IE: 5195551234@pcs.rogers.com) as Pontiac suggested?
Were you thinking about sending the email from your phone? Would that be easier than using Fuelly Mobile to add the fuel-up? You might look into SMS rates from Canada for adding via SMS. It might not be prohibitively expensive.