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Go with as high of voltage as you can if you're trying to make a highway capable vehicle. The less voltage you have the more amps you're going to need to pull and the greater the peukert effect which even lithium is effected by. That all adds up to less range and less battery life. You also have to take into consideration hills which require quite a bit more power to go up than just cruising on a flat road.
You can definitely hypermile an EV, just not to the extent you can with a ICE powered vehicle. There is less inefficiency in the system, so there is less to take out. Basically the faster you go in an EV the more wh/mile you're going to pull period. The only exception will be if you're mashing your brakes in town a lot. Regenerative braking will negate this to some extent but its not nearly 100% efficient, so you're still loosing power by using it.
There is such a thing as regenerative shocks, however I don't believe they're readily (perhaps not even commercially) available.
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