I think it is not refundable when you rent a car with bitcoin. Right after I read this topic, I make a research and found this out
https://www.e-zrentacar.com/blog/paying-for-your-car-rental-with-bitcoin/ .Yes I get the point of not bringing large amount of money on your pocket but I am still wondering what would I feel if bitcoin price rises. Of course I'll first regret because if I used fiat instead of crypto in that car rental, I already gain profit in my bitcoin.
People have different opinions regarding the issue of the price because when you think like that, you can not really use bitcoin as a means of payment. the moment you are about to pay some bills, you're thinking about its price in the next hours or days. Well, it's not gonna work that way though. the idea behind bitcoin is to become the means of payment in the world whatever industries you have out there. the moment you gonna pay with it, don't think of its price in the next day because tomorrow is another thing than today. it's always not the same when you paid with it there are two possible scenarios, the price will gonna rise or it will fall at some point.