Quote:
Originally Posted by El Sid
It is wrong.
Yes, the engine may be at it's most efficient power/fuel point, but to say that the engine as air pump burns less fuel at 4000 rpm when at 2000 it is using roughly half as much air and therefore fuel is just wrong.
The term roughly is due to the volumetric efficiency reaches a maximum at some point - say for a N/A DOHC 92% @ 4000 and only 88% @2000, but if there is less air our modern FI will portion to fuel accordingly.
Better percentage at torque peak - less fuel at lower rpm.
El Sid
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I guarantee it! Have you driven very far in 5th gear at 2000 RPM? Let's make the point more clearly...how about doing 40 in 5th gear at 1600 rpm or 35mph in 5th at 1400...are you still going to claim better gas mileage at 30 in 5th at 1200 RPM?
Try it in the real world...Honda's cruise control won't even work at those speeds, because they don't want damage done to their engines...
-Quick