chip-3door, admittedly im not very up on rolling roads. Are the losses calculated when they let off the throttle and let the wheels free spin to a stop?

He hasn't DIY'd the FC Commander, he travelled up to Newbury yesterday morning and had a bloke map the car while he was driving around, so it had a wideband lambda probe up the arse and was using a laptop etc, so it should be a proper job.