1.65% return with cc

i have been carrying and using an amex cash rebate card for quite some time and have been pretty happy with it -- last year, i got a refund of some $750 by putting absolutely every purchase on the card.

well, thanks to the handy tools available right on the amex website, it was easy for me to calculate that i actually earned a 1.65% return on that money. i pay my balance in full every month, so it's really free money.