MPG chart.

[tsubaki]

The actuality of it is, how it always was.
The faster you can go while consuming the least amount of fuel, the farther you can go.

The gph gauge was very important to me since I have only 2/20 gallon saddle tanks.
If I was fishing offshore and I was pressed for time to get back without running out of fuel I could calculate my available range by the gph/mph chart.

Our dock is 15 miles from the sound and around here we need to run another 6 miles to the first offshore reef which is in only 30' of water.
The next nearest reef is 10 miles offshore but it's in only 40' of water.
To get into some decent fish we need to be about 25 miles offshore and at that it's only 55' deep.

So you figure if I was wanting to fish 25 miles offshore and if I was able to maintain 30mph at 11.06gph (2.71mpg) I could go 108 miles on 40 gallons of fuel. The actual trip would be 80 miles and consume 30 gallons of fuel.

See why I was so worried about the fuel consumption?