Hi all - I currently have an Avis Standard SUV reserved from Costco for two weeks out of Medford OR (returning to SFO). I really want a luxury car as long as it's a mid size luxury crossover like a Volvo XC60 or similar. The Standard SUV price is 1650 and the luxury price is 2650. Would it be cheaper to upgrade the Standard SUV at the counter or should I just go ahead and reserve it ahead of time?

I am also seeing a Luxury price of 2126 if I prepay on Avis.com. Not sure if they would upgrade me for less than that at the counter?

Thanks!