Comment That's the Chevy Volt. (Score 1) 360
A pure electric first gear would marry the best torque range of electric motors would free the IC engine of its low end torque requirements. No battery, no regenerative braking or fancy nancy stuff.
That's the Chevy Volt. Modest engine and battery, good electric motor. The Honda FCX has electric drive, a fuel cell, and ultracapacitors for acceleration boost.
A pure electric transmission with an IC engine? That's a Diesel-electric locomotive. Works very well, especially with modern solid-state controls. Overkill for a car, where getting started isn't that hard and clutches are in slip for only a second or two. A huge win for trains, where getting all that mass moving is the hardest part of the job.