Originally Posted by drbond
Absolutely not! A fuel transaction has to have an SIC code for fuel to be eligible for cash back of 5%. SIC codes are different internationally and are not even called SIC codes, they also do not break down to the product type. The transaction will look like a purchase at kmart to a US CC company and there is no way for them to know it was for fuel, much less anything else.
drbond is correct. While you occasionally may find merchants classified according to the US system (e.g., I think I once got 5% back on my Citi Dividend card for a gas purchase in Canada), most int'l merchants aren't going to show up as the 5% categories, and there's nothing you can do to appeal, since the T&Cs clearly state that the cash back is based on how it's reported, even if it's in error.