Re: Only 10%?
> "measure a vehicle's emissions whilst it achieves its stated 0-62 time for example"
In terms of the total emissions over the time it takes to get to 62, that could be an interesting test.
Does going full bore for 4 seconds with a giganto-engine produce more CO2 than full-bore for 15 seconds in an econo-box?
You could extend that to a set route that replicates a commute, or some other journey. With a bigger engine your acceleration phases will be done quicker, and you need a lighter throttle to maintain cruise speeds.