05-11-2016, 09:17 AM
(04-11-2016, 09:03 PM)Paul Baldwin Wrote: Depending on the car and how new it is this may well be the case.
However, neutral, downhill , means no engine breaking and limited transmission losses, depending on the terrain you are travelling over you may well be able to use the inertia of the vehicle to overcome some gradients that would be totally impossible with the engine at closed throttle in gear. Therefore it is possible to save fuel by coasting.
Yeah this...
XUDs and anything rotary pumped do have fuel cut off (pretty much - the IQ goes down to a small fraction of that on idle, literally barely measurable) too... HDis too and pretty much any fuel injected car in the last 30 years.
The pumping losses sometimes cannot overcome the minute quantity of fuel being injected... However lightly placing your foot on the throttle to maintain speed is likely to be just as efficient as the engine running at idle anyway...
Basically yeah, stop worrying about it.
