We have 2 boats and have run Sta-Bil for years we treat every gallon every time .
We live like many others in a lay up state and want to be sure "ALL" the fuel is treated .
Just in the last year I have switched over to StarTron .
Requires less 1oz per16g . Plus has Enzyme to clean your system.
Both treat E-10 issues and prevent Phase Seperation !
Both treatments Sta-Bil red or blue can be used with StarTron in fuel at the same time !
IT's not Possible to over treat with any of the above mentioned products , you'll suffer no ill effect except in the wallet
Craig