At full revs they don't and tend to be fairly similar, but at lower revs they do, as per more torque for the diesel.

Just curious regarding the two grades of diesel here. A and B
I presume one has a lesser tax as in the UK.
Is that only for agricultural use or other commercial purposes ?

or shadey people

Petrol engines far out perform diesels in horse power and can can be tuned to do so for torque as well,look up variable cam timing etc, hence you don't see diesel engines Aston Martins or Ferrari`s ,

Gasoleo B is for non highway commercial vehicles such as excavators ,tractors etc,you need a special bank account and debit card to buy the stuff , it`s dyed red and is around 30 to 40% cheaper than gasoleo A.

Of course petrol can always produce more overall horsepower if required, but efficiency is a big factor in designing most road vehicles.

Diesel job is much the same as in the UK then, though the tax on the UK red has increased a lot to what it used to be,if it used to be taxed at all.
The red was virtually peanuts at one time.

Hi Fred how do you look up what Local Authority car tax rates?

Find the Ayuntamiento web site and look up the local ordenanzas.

You will find it somewhere in there.