Thinking about booking a car in the US from Sixt, read somewhere to use the UK/EU's site because it includes comprehensive insurance and supplemental liability. After checking both versions of SIXT's site, the European site includes Supp and Comp for the same price as the US site w/o any of those options. I am a US citizen but was just wondering if I booked from the euro site, would they still honor the comp & supp included in the price. Does anybody have any input on this?

The only other similar situation I could think of, was people buying Norwegian Airline tickets on the Norwegian website because its cheaper than the US site. Norwegian does honor that.