All hybrids get worse long distance highway milage than the equivalent
sized non-hybrid because you have an undersized engine dragging a huge
battery with little or no regenerative braking -- when do you lift
your foot completely off the gas on the interestate? That means you
use battery power on upgrades and then have to recharge it, and you
get NO recovery of energy by regenerative braking (which is where the
high milage comes from, not the hybrid nature of the drive train).
The weight of the car, rolling resistance, and the drag coefficient
are the only determinants for milage on the highway once the battery
is fully charged, and milage will drop to the low 30's or less, often
to the mid 20's.
Stop and go driving they will top 50, but then my brother's Jetta TDI
tops 50 on the highway without the battery and all the other crap. Mid
40s in town, same as my 300d -- milage is only slightly different
between highway and mixed suburban.
Peter
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