This is true... I now have a new/different car, same 11mm but sans fuel cooler (for now). I witnessed some pretty alarming temps last summer, both fuel and intake. Didn't log anything and I don't really remember the exact numbers. I do remember being pretty surprised though.I'd like to see some data on how rapidly the rise in temperatures in the fuel tank, where hot fuel returning from the engine is mixed with fuel at ambient temperature.
Also, how effective is a fuel cooler going to be if the air blowing through the cooler is 100°F or 130°F or 160°F? The hotter the day and the hotter the "track" temperature, the less effective the fuel cooler will be.
I would tend to agree with everything above, intake temps are probably more of a concern for me right now. During hot days, the engine bay is easily 160º-180ºF and the intake air, even hotter. It's a bigger IC for me right now. In terms of performance, I would say there's more to be gained there.
I will install the fuel cooler. I still feel it's good insurance. My only reservation would be cold climates. It's pretty hot here right not, maybe I'll log something tomorrow...