Hi Mboy,
I agree with Nick.
One thing ... some places put additives (besides ethanol) in their fuel. You can tell because the fuel looks reddish.
The marina I am at ahs this stuff called Valvatech marine additive, supposedly for octance boost.
I don't think it does anything but I wanted to make you aware.
Do you use Startron or MDR (E-zorb) as an additive?
I used Startron the past 2 Summers and now switched to MDR.
If there is water, you will see it ... no need to change the filter because it separates the water. I am on a hyper-aggressive schedule of changing every 10 hrs on the engine. You should only have to change it seasonally.
I wish I could pick one fuel vendor and stick to them. However, that is not practical for me.
If I could, I would pick a place that sells a lot of fuel and has above ground, frequently serviced tanks.
Ed