Very much the opposite I'm afraid - US residentsfor some reason get a much poorer deal than we do as UK residentsYou will probably be paying up to twice as much to rent a vehicle.
As an example I've just paid £490 for 16 days LCAR rental. I went onto the same rental providers website and got a quote for the same package as a US citizen - same dates, same car, same everything. $2300! $400 of that was CDW you might not need as your auto insurance may cover it but even without that it's HUGELY more expensive. As a US resident even a quote for a Chevrolet Spark was more expensive than the Cadillac ATS or similar I'd booked.
The rates we get as UK residents booking in the US are unbeleivable.