When self serve happened in the late seventy's/early eighty's here on the west coast, Oregon passed a law 'not' allowing it. They have never had self serve and I get into trouble every time I go though there. The attendent's freak out when I put my 2oz of UCL in before pumping gas and want to know what I am doing. I put in 2oz of UCL for every 6 to 8gal of gas. The car is rated 39/43 in EPA and I have averaged 43.03mpg overall since I started using it at 37thou (had averaged 41 before with a best of 46-have done numerous runs of 48+mpg since) Today I have 160++thou on the car (98Suzuki Swift 1.3L 4cyl). Have never had a plug foul or any deposits when I put them at 50thou changes-Bosch +2's and in the 6 oil samples taken from 60thou thu 125thou their has NEVER been a problem with any of the sample ###'s. 10thou per change for the first 5 samples and 15thou for the last using M1(3samples)AMS & GC(1 each) and M1-EP for the 15thou run(was told to go 17thou on the next sample run using EP by Blackstone) Yes I swear in the use of UCL!!!!!