[bsmith0404]

I vary depending on weather. Hot days on dark blacktop road I drop to 60. on cool days or a light, gray concrete road I'll go 65. Not sure how much difference it makes in the tires temps, but it makes a difference in my peace of mind. As stated before, it doesn't make a lot of difference in the end result for distance traveled. I have been passed many, many times by people going 70 plus. Can't tell you how many times I have re-passed them while they are pulled over changing a tire. As for fuel economy, I haven't noticed a difference between 60 and 65.