Not true. 2 stroke and 4 stroke work the same way. Throttle plate and
timing are both adjusted as you increase and decrease throttle (assuming it
is a carb). EFI adjusts air thru the plate and timing and fuel.

As for the fuel savings, little difference between a 4 stroke efi and a new
2 stroke efi (not talking DFI which is even better).

--
Tony
my boats and autos - http://t.thomas.home.mchsi.com


"Gfretwell" wrote in message
...
I can't imagine anyone worrying about it with an outboard.

I guess you don't think about economy on an outboard until you actually
see
some. The difference was striking when I went from an old 2 stroke to a 4
stroke. Part of the savings is in the ability to run smoothly at slower
speeds
(manatee mandated) but I see a significant savings overall.
Running at slow speed my 60hp merc doesn't seem to use any fuel at all. My
old
2 stroke seemed to use as much at 700-800RPM as it did at 2300. Not
surprising
if you look at the respective throttle openings tho.
2 strokes slow down by retarding the timing, not throttling the carb.