Are you saying you put an additive in with EVERY fillup? Which one? I use PS DieselKleen once like every 5K or 10K. It seems to keep everything like new when the dealer changes the filter. They comment that it could have easily gone another 20K. I also fill up with Murphy(Walmart brand) that may contain up to 5%bio. In our area it's the cheapest a $3.25/gal. Been using their gas in all my cars for decades without a single fuel issue.
I use Opti Lube XPD. Suppose to increase Cetane levels and lubrication properties. I do not have access to and Bio blend to help the lubrication so this works for me.
These are the "claims"
Enhanced Lubricity for Reduced Fuel System Wear
Improved Fuel Economy (See Diesel Power Magazine Study
here)
Increased Power
Reduced Deposits
Reduced Emissions
Prevents Rust & Corrosion
Cleans Injectors, keeps them clean
Improved Storage Stability (More than doubles storage life of diesel fuel)
Improved Water Separation
Improved Cold Weather Performance
Compatible with all vehicle emissions systems