Pentium M only has longer battery life if you use the CPU at 100% all of the time , in normal use the turion ML will have longer battery life, and the Turion MT will haver longer battery life than similar performance Pentium M in any situation. Forgot about the Laptop Logic article?
Turion MT CPUs have a max TDP of 25W, Pentium M 760 has a 27W TDP , but this is the TDP at 75% of load so 0.25*27=6.75 max TDP of PM=27+6.75=33.75W. The Pentium M consumes at least 34Wmax, the Turion MT 25W max, also the turion chipsets consumes less because some there is no memory controller in it, it is inside the CPU, so PM + chipsets consumes more than Turion MT + chipset, there is no reason for the battery to last more with the Pentium M.