OK, I have to chime in here. I am normally a skeptic and I gave MMO a chance in my 1991 Lincoln Town Car. I normally get 22- 22.5 mpg on the highway out of this ol car, I check my mpg faithfully. Lots of cruise control driving at 70 mph.
Well, with MMO added at 4 oz per 10 gallons of gas, I got...