Comparing mileage of plug-in hybrids
I find that comparing plug-in hybrid vehicles is almost meaningless. The mileage is highly dependent on the type of trips (to some extent explained by the City/Highway ratio, though only available on the level of the individual car) but also by the availability of charging and willingness to actually charge (which, frankly, is optional with this vehicle type and some people don't bother).
When combined with the current inability to consistently distinguish between plug-in and non-plug-in hybrids (see my other post "Engine type consolidation") the mileages vary wildly.
Even if the plug-in vs non-plug-in filtering is fixed, I don't claim to have a solution for comparing the plug-in hybrids mileages. Perhaps asking the users for number of charges or kWh's charges at the time of the fuel-up?
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