spark plug heat range effect on fuel econ

[gone-ot]

...a picture tells the story:

[some_other_dave]

Originally Posted by sbestca

I'll disagree with you Dave.
IF the engine is misfiring at light load/lean mixture ...

Actually, I think we agree. What you are describing above is that a spark capable of igniting the mixture is not being generated. And in that case, it can very well make sense to change what spark plug you're running.

But there is no "magic bullet".

-soD