Re: Time for petrol only for private transport
Hybrids use petrol rather than diesel for a few reasons. Petrol engines per Kw are much lighter, diesel engine blocks need to be heavier due to the higher compression ratios. New small petrol engines are therefore per kg more efficient than small diesels. Then factor in the emission control, diesel will require many more bolt on devices to meet the new standards, yet more weight. Petrol engines also allow more fine grained control of engine characteristics to integrate power from combustion and electrical sources and offer much better engine braking characteristics than diesel for energy recovery.