Gall prototeip y Riversimple Rasa, sydd ar fin mynd ar daith hyrwyddo o amgylch dinasoedd y DU, fynd o 0 i 50 milltir yr awr mewn 8 eiliad a gall gyrraedd cyflymder o hyd at 60 milltir yr awr. Mae’r car oddeutu tair gwaith mor effeithlon â’r ceir hydrogen sydd ar werth ar hyn o bryd.
The Riversimple Rasa prototype, which is embarking on a promotional  tour of UK cities,  can do 0-50 mph in 8 seconds and can  reach speeds of up to 60mph. It is about three times as efficient as the hydrogen cars currently on the market.