I use my '04 F250 for repossessions. I work in the Los Angeles area. My truck has 235/85/r16 currently. I would like to go narrower 215/85/r16. I never tow anything heavy or long. Maybe another 3/4 ton truck at most and Never very far. I run a quality Bridgestone Dueler E rated tire. I'm looking to shave a few points off my maintenance and fuel costs.