I found that if I reduce my tire pressure to 29 psi intead of the regular 32 psi, when the SUV is cold, improved the performance. If you start at 29 psi when cold the tire, at least on the touring-Michelin tires, heat up to 31 once they hit normal operating temperature. If you start at 32 psi when cold it reaches 34-35 psi which maks for a firmer ride over bumps. I notice a significant difference especially in New York City where the roads are much bumpier. Try it makes a big difference. The gas mileage has been the same about 13-22 depends on conditions.