You are backwards on the mileage, the bigger the gaps between tread blocks means the worse gas mileage you will get because those gaps hit the pavement causing resistance. If you could post what tires you have right now i will give you some suggestions on what new tires to buy.
About comfort tires, they will have tread blocks running all the way around the tire without any huge breaks, that makes them quiet on the street and they get better gas mileage because they are smooth on pavement. The breaks in the tread, like you have on ur tires, are designed to grab the ground when you are on unpaved roads.
Off the top of my head, i would suggest the Goodyear Wrangler SR-A. But i could find you something better if i know what u have right now, just for comparison.
Hey hey, my my. Rock and roll will never die. - Neil Young
We've got too many gangsters doin dirty deeds. Too much corruption and crime in the street. It's time the long arm of the law put a few more in the ground. Send them all to their maker and he'll settle them down. - Toby Keith & Willie Nelson
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