Should I use Sea Foam Motor Treatment or High Mileage for trucks and SUV’s? [SOLVED]

Thanks for the question!

I’d use High Mileage. It’s a strong cleaner formulated to clean stubborn residues and deposits in fuel and oil after years of buildup.
I’d add a full 16 oz can to a low tank of fuel (1/8 to 1/4 tank or so). Then, drive until almost empty before refueling (at least 20 miles if you can to give the High Mileage time to run through the fuel system). This creates a high cleaning concentration that works much faster and better than adding to a high amount of fuel.