Is this normal?: I put 6 oz. of VSOT in my oil (6qt. capacity) right before I filled up my gas tank (31 gallon) a week or so ago. Now I've already got about 20 miles more on this tank and its not empty yet. I will get gas tonight or tomorrow morning and do the math but I know I'm getting better MPG already. That's the only change I've made on this tank of gas. Three weeks ago I put 5psi more in the tires and noticed no difference and about 6 weeks ago I put new O2 sensors in and didn't notice too much of a change. I know one tank is not enough of a test but my mileage per tank never goes this high unless I'm on the highway 100% of the time and I wasn't. I will report back the actual improvement, but has anyone else seen this?