Is there any point to P&G in a diesel?

[hummingbird]

Pholostan, an MPGuino or similar instant FE meter will help you, so that you know how much it is consuming at the instant, and you should be able to get back to the optimum setting where the engine is not running rich.

My bro-in-law is a engine development tester and he too pointed out the engine running rich when the throttle is floored. This is the reason why the hypermiling commandments call for say 80-85% throttle, to avoid getting the ECU turn the mixture rich. (or so I think ;-)

[modmonster]

i would think your right. there is no improvement. also think that P&G is only efficient /usefull in a large engine car. i tried it in a small engine 1L petrol and it used more fuel than normal. in small engine cars, motorway speeds require closer to wide open throttle anyway so there is no improvement.

motorway is different to city driving though and we can all benifit from not ideling the engine when DECELERATING. (EOC)