No point in having a hot rod if you do not drive it. We have run up over 15000 kms on our Road runner in the three years that we have owned it. It runs a 440 stroked out to 505 cubic inches aluminum heads 10.5 to 1 compression a Holley 850 mechanical 4150 large roller cam and manual shift automatic transmission with 3200 rpm stall converter. It like gas . The 3.91 rear gears ensure that. I am fairly careful on the gas that I run. I use an air fuel meter and the ethanol shows up. Petro gas certainly has more in it than Shell. 91 at Parry sound fuels is still all dinosaur bones. They supply almost all of the marinas around here and haul it from Ottawa refinery. Yes I test it regularly.
We have seen phase seperation and fuel problems with all additves including Seafoam the biggest solution is to use your stuff and get the old fuel out. the newer boats and sleds no longer have the venting straight to the atmosphere and this has helped a lot.