Fisker Karma against the competition:Engineers selected a fully blended, as opposed to an overlay, regenerative braking system to supplement the standard brake system. This type of system, while more challenging to develop, improves fuel economy and range and helps preserve a more natural braking feel.
Regenerative braking recovers kinetic energy during deceleration and feeds it back into the battery. Using the right-hand steering wheel paddle, the driver can operate the Karma’s unique Hill Mode to vary the regenerative braking effect in three steps; this function provides an effect similar to downshifting a conventional car’s transmission to offer more control on downhill grades or when slowing down. Over some drive cycles up to 20% of energy used from the battery can come from regen braking.
A blended regen system also adds a significant level of recovered energy vs. an overlay-type system. In the Karma, the blended system contributes to optimal battery range and an equivalent increase of up to three miles per gallon in city traffic, compared to using an overlay-type system. The blended regen system is essential to the Karma achieving 100-mpg capability.