The whole purpose of gearbox is to multiply torque on wheels. As diesels produce more torque, it should theoretically require less gears compared to petrol counterparts (which produces less torque and thus require more torque multiplication).
Electric motors produce constant torque at any RPM, so electric cars don't really require a gearbox (except final drive).
So, in theory, a flat torque producing diesel does not need so many gears as of petrol engines.
Some cars have same 4-speed gears (ie with same gear ratio) for both petrol and diesel variants - which is surprising.
That means petrol auto model need to frequently hunt for gears where as diesel auto can cruise comfortably without much change.
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