Rereading jbanks15's comments about Techron's fuel cleaner prompts me to add Sta-Bil 360 Marine to the mix. I recall that years ago the editor of the technical column in Stars Magazine wrote that he considered the product (formerly Sta-Bil Marine Formula) to be required for pre-ethanol cars and recommended for subsequent vehicles to protect against the harmful (?) effects of blended gasoline. I won't add my thought about Sta-Bil or whether I use it (I have no financial interests in the product), but I will post the following from its web site:
STA-BIL® 360°™Marine
Prevents corrosion above and below the fuel line – where no other additive can.
Ultimate treatment and protection against Ethanol blended fuels.
Cleans fuel system to improve performance
Stabilizes fuel up to 12 months.
Increases power and fuel efficiency.
Use at every fillup.
With my best wishes for 2016.