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***HDi fun*** · 07-09-2009, 04:31 PM

Diesel will always win over petrol inthe energy per litre simply on calorific value if measured by volume. Simply because there's more energy in a litre of diesel than there is in a litre of petrol.

HOWEVER, let's say that fuel was sold by mass (say in kg). Petrol is less dense than diesel so a Kg of petrol is light than a Kg of diesel.

This might make a complete change to the supposed fuel economy of diesel.

07-09-2009, 04:31 PM	#12 (permalink)
*HDi fun* Moderator Torque King Car: E39 Join Date: Apr 2006 Location: Buckinghamshire UK Posts: 11,306	Re: Best diesel engine Jag or BMW Diesel will always win over petrol inthe energy per litre simply on calorific value if measured by volume. Simply because there's more energy in a litre of diesel than there is in a litre of petrol. HOWEVER, let's say that fuel was sold by mass (say in kg). Petrol is less dense than diesel so a Kg of petrol is light than a Kg of diesel. This might make a complete change to the supposed fuel economy of diesel.