Interestingly, the opposite is true. Unlike petrol cars that idle and waste fuel in jams, EVs are at their most efficient in stop-and-go traffic because the electric motor uses almost no energy when stationary, and regenerative braking captures energy every time you slow down . During a media drive from KL to Penang, drivers noted that the smart #1's "range-extending tips" included utilizing this regenerative braking effectively, making traffic jams less of a concern for range than high-speed highway driving .