[Hersbird]

I would do it not for the fuel economy savings but the savings the bigger tires will get in how many miles they last. I switched my PWC trailer from 8's to 13's because the 8's seemed to wear down to the cords in just a year. The 13's have been on for 4 years now and still look new. I used to think I had an alignment problem but it was just the tiny tires couldn't take it.