Hi Sweetbeet:

___Both the FEH and MM HEV’s use the Atkinson intake as well as the Prius II. The HH and RXh’s supposedly do not use an Atkinson intake cycle but when you look up their V6’s output, it is less then their non-hybrid Highlander and RX 330 - V6 counterparts. Toyota did something to detune those V6’s for lesser HP and if it is not Atkinsonized (Toyota says it is not), then it is something else?

___Good Luck

___Wayne R. Gerdes