Originally Posted By: Lex94
High Moly/Boron can increase MPG by 15% in an engine with high internal friction. My rattle-box H4 Subaru goes from 27 to 30 MPG just using high Moly/Boron regular Pennzoil 10w30.
I need to try this additive.
Nope. Ridiculous. People think they see things, when MPG is so sensitive to driving habits, wind, terrain, tire inflation, mother-in-law's weight in back seat (or trunk), etc.
