I'm seeing more dual-fuel vehicles (presumably gasoline and E85 ?) becoming available from Detroit. Do you think those vehicles take all of these things into account, or do the gaskets and seals not get brittle and fall apart until after the warranty expires anyways ?

Geez I sound cynical today

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8