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ZAPPADLES,
According to my research, figure on 4-4.5 mpg for the Yamaha and 6 to 6.5 mpg on the ETEC when cruising.

So with the ETEC and a twenty gallon tank you increased your range by about 40 miles give or take a few.

I did some cost and range figures if you are interested...

Average lakes where I fish I only average about 10 miles per day.
Yamaha burns 10/4 = 2.5 gallons
ETEC burns 10/6 = 1.6 gallons
.9 gallons saved per day at $3.00 per gallon = $2.70

When I fish the ocean I run on average 70 miles per day
Yamaha burns 70/4 = 17.5 gallons
ETEC burns 70/6 = 11.6 gallons
5.9 gallons saved per day at $3.00 per gallon = $17.70

But the fuel cost isn't the biggest thing the range is what I want when I am on the ocean.
I have a 20 gallon tank so...
The Yamaha leaves me with about 2.5 gallons of spare fuel on an average run.
The ETEC leaves me with about 8.4 gallons of spare fuel on an average run.