If you want to keep your tanks clean, run some biodiesel every so often. I recently bought 5 containers of B5 because the price has come down to near ULSD. The experience of bio users is they usually have to change the fuel filter not long after, as it cleans crud out of the tank and puts it in solution and accumulates on the fuel filter. I'm working on my first B5 container.
*Can anyone explain the logic here?
Why in the world would I want to buy a more expensive fuel, just so I can go through the problems of changing my fuel filter? Diesel engines have been used for over a century, and the only real fuel tank issues I know of are gelling and algae.
About 3 years ago I got a bottle of Soltron algicide for diesel fuel. The label says to use one oz per 30 gallons of fuel. Since I have a 15 gal tank, and usually add 5 gal at a time, it is hard to measure that small an amount and I am sure that the amount I guestimate is too much, but I have never had a problem.