I was going to ask exactly the same question!
The US certainly has it's own unique way for everything
Measurements - World uses metric, US uses imperial (UK is partway through conversion away from their own system)
Fuel Octanne - World uses RON, US uses AKI
Mobile phones - World uses standard frequencies, US uses alternate frequencies
There a lot of other examples. Travelled in and out of US possibly 12 odd times, and find it's always an interesting experience to travel there and find it always takes how it likes to take it's own unique path - almost as if international standards are there to be challenged.
Travelling to countries like Japan and Germany, there is no adjustment (apart form language) because the standards are basically the same. Especially so between Japan and Australia where swapping between the two in terms of driving is zero effort (apart from the fact they drive so slowly in Japan). Same side of road, same units, same fuel, same everything.... different language.