Obama’s campaign sticks to its tire inflation plan, which improves the mileage 3.3 percent.

Unfortunately, all this would do for the one-third of drivers who have insufficiently inflated tires is get them roughly where they were before many of them were forced to use ethanol blends, as required by law here in Virginia and many other states. From the Iowa Corn Growers Association: “The most current information derived from controlled environmental testing is that on fuel injected vehicles, fuel mileage may decrease by approximately 2 percent.”