(18 Jul 2015, 7:43 pm)G-CPTN wrote It's not that simple.
You would have to look at the torque and the gearing (including the number of ratios) to compare performance.
Similar calculations for fuel consumption.
As long as a vehicle has the 'power' to meet the schedules it doesn't need extra - though it is useful to have some in reserve for delays and performance fall-off between services/repairs.
A more powerful engine needn't mean greater fuel consumption.
I disagree. The engine isn't going to have that level of performance over it's lifespan, and will lose power each year. So if it's struggling as new, then it's likely to run into real difficulties in a couple of years. Asking an engine to do something that it wasn't designed for, and you might as well be smashing your head against a brick wall.