I don't think those numbers are right. The US consumes about 400 million gallons of gas per day. That's only 146,000,000,000 (that's billions by the way) per year. There is no way that inflating your tires and getting an oil change is saving 10% of our gasoline consumption. At best it's 2-3%, AT BEST. Which is closer to a saving of about 3 billions gallons per year. Nothing to sneeze at but in the big picture very small.
In oil consumption assuming 19 gallons of gas per barrell it's about 230 million barrels a year saved or less then 1 million barrels a day. Even if estimates are that we could get 6 million barrels out of the ground a day easily with 3 years, that is going to have a much bigger effect than inflating your tires.