The Insight uses the first generation of Honda's Integrated Motor Assist (IMA) hybrid technology. (The next generation, used in the Honda Civic Hybrid, is much more space-efficient.) The Insight's electric assist is an ultrathin 60 mm (about 2.4 inches) brushless 10-kW electric motor located on the crankshaft. Located behind the seats are a series of 120 commercial grade "D" sized 1.2 V NiMH batteries wired to provide a nominal 144 V DC and a capacity of 6.5 AH. During heavy acceleration, the NiMH batteries drive the electric motor, providing additional power; during deceleration, the motor acts as a generator and recharges the batteries using a process called regenerative braking. A computer control module regulates how much power comes from the internal combustion engine, and how much from the electric motor; in the CVT variant, it also finds the optimal gear ratio. The digital displays on the dashboard display fuel consumption instantaneously. On the manual transmission up and down arrows suggest when to shift gears. Dashboard gauges monitor the current battery status, instantaneous fuel consumption, and mode of the electric motor — standby, engine assist or charging the batteries. High pressure ( / ), low rolling resistance tires and the use of low viscosity "0W-20" synthetic oil enhance fuel economy.