I think GM used to offer the 3800 in the old LuminaAPV/TransPort/Sillouette, but that's pretty irrelevant. If Honda wants to put a 3.8 in the Odyssey, I'm sure they can without fuel economy concerns. Mate that with a five speed transmission and your fuel economy on the freeway is almost at four cylinder levels, anyway. If Honda does introduce a new engine block, that should lead the way for good things to come with the CL/TL, RL, and NSX.