1st time I pulled into a truck stop, and all they had was B20 I was hesitant to use it. I really had no choice, so I filled up. Dodnt notice any difference while towing my 43 ft 5th wheel (18,000 lbs.). Over a course of 48 states, and many, many miles I have used it off and on, and I must don't worry about it anymore. I have 46,000 miles on this PU now with no fuel related issues. Last time I,changed filters the old ones,looked like they could have went at least 10k more.