If you're into that sort of thing, the EV1 decision (From "Who Killed the Electric Car") was the 2nd time GM made a poor decision on which direction to take it's technology (or the Oil Lobby AGAIN was in their back pocket).
From EV WORLD:
PHOTO OF THE WEEK: (Sorry, not sure how to get the photo's to paste, it's a Gremlinesque little car) GM's XP-883 was its first plug-in hybrid, developed in 1969. While small and sluggish in performance, its lead-acid batteries could be charged with 115 volt household current. The idea was to drive in the city on electric power and on the highway using the car's tiny two-cylinder engine. Top speed was 60 mph but it took 28 seconds to go from zero to 60. Imagine where we'd be had GM engineers kept improving on the technology.
http://evworld.com/insider.cfm