I know Danny (with Volant) said it would work on the 09 Tundra 5.7L, and I thought he said they would work on the 10 models. Let me search around a tad and see if I can find it..... ah, found it (see this thread:
http://www.toyotatundraforum.com/vol...9-tundras.html)
And I have seen some initial improvement in mpg, but for some reason on my 07 5.7L, the mpg gain slowly erodes over time (see my post #5 in this thread:
http://www.toyotatundraforum.com/vol...am-gasket.html).