what i mean is that it is possible that e85 takes longer to reach peak cylinder pressure from ignition, so that at the same pressure level it may be easier on the internals since the pressure build is more gradual an less sharp. so even at the same max pressure e85 may produce less shock load on the piston and rod.
Of course i don't know the burn speed of the two fuels so it could actually be more, especially since burn speed changes at elevated pressures.
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