Originally Posted by SixAlpha

A similar trick also works with most Speedway/SuperAmerica gas stations in the southeast. In many places you can get rechargeable gas cards through AAA that offer an extra discount above & beyond what the normal S/SA gift cards offer. Speeday also has their own loyalty program you can sign up for... so you get to TRIPLE dip! Buy your gift cards on your Skymiles AMEX and get your double/triple miles, get the gift card discount, AND get points on the Speedway loyalty program which can be redeemed for free gas.