My car is EFI but it is plumbed with the regulator up front. Being a street car the recirculating fuel heats up pretty fast, it eventually gets all the fuel hot. My return fuel temp runs 120 degrees pretty easily and that is with running it through a cooler with a fan on it . Like Andy said a lot of EFI setups are starting to keep the regulator in the back to keep from returning hot fuel. I will eventually try that but have other items on the list first.

Couple of things to add, my car returns from the rails so that adds heat, I also didn't log temps before I added the fuel cooler so I really don't know how much it helps, it is back behind the stock fuel tank.