Quote:
Originally Posted by radroach
Should we go into a D4S discussion? I find that between 1000-3500 rpm I'll get around 20mpg, and then it will go up to ~40-50mpg when D4S port injection starts coasting in the 3500-4000 range. Anybody else want to chime in on this?
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My understanding is that the two systems work in complex synergy. There is no strict cut-off when one is working and the other isn't, except at the lowest speeds. I agree though that their is something about the system that causes the engine to have a huge differential between highway-only driving and ordinary 45-50mph back road cruising.