The spin up weight of the tires would affect the city mileage. I find it best to compare tires at the tirerack.com/ site. You can compare tires, weights, tire rotation for a mile and etc.

I'm using the Energy tires that came with my four month old TCH. I hope to stay with them. I'm running them at 40 psi cold. It may be about 10,000 miles before I can tell any wear pattern. I thought 40 psi would be too much but they do ride good.