While there's no bonus for fuel purchases, there are also no caps on how much you can earn with the dining and grocery bonuses. (rewardexpert.com)
I bought one for a quick snack at the airport and noticed they were gluten - free too, which is a bonus for so many of you out there! (mommieswithstyle.com)
With this much time in one place, I even started getting a social life, which is another bonus of travelling slowly. (bigtravelnut.com)