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It would be helpful if your charting was available for us to see. As it is, it appears you experience wide swings in fe tank-to-tank so analysis for fe change causes may be difficult/impossible.
Your claims look suspect to me because the ethanol fe drop you state does not match my and many others' experiences. I admit I do disregard the claims of those who have an obvious anti-ethanol agenda.
If there is a widespread IDENTIFIABLE fe drop in your region maybe there is something going on with the regional boutique fuel composition; maybe it is ethanol and maybe it is something other than ethanol.
Your fuel pump story also does not match my experience at all. I've been running old non flex-fuel vehicles (early '90's models) on E10 at a minimum and E85 at a maximum for several years and have not replaced a single fuel pump, sending unit, or even fuel filter.
P.S. E85 has proven to be easier on my pocket, either straight or blended with E10. It is often about 40 cents/gallon cheaper and any fe decline is more than offset by that.
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