Quote:
Originally Posted by Diesel_Dave
I have to disagree with you there, diesel vs. gasoline will affect the efficiency of the engine, but factors like weight and rolling resistance determine how much power is required from the engine. The engine determines how efficiently the power is produced, but if you reduce the the power required, it's going to help just as much percentage-wise either way.
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I know the science, and don't disagree at all with it.
Just from mine & others experience, diesel vehicles seem to be able to take weight changes with less impact on fuel economy than petrol vehicles.
Science may well explain this in the torque charachteristics of each engine type and the way gearboxes are mated to the engines. I haven't got any proof or done any particular studies on this, it is just personal experiences.
Having said that, I do keep my vehicle light with regular cleanouts, tyres pumped up, no roof racks etc.