Hi. I am new to the forum. I have a 2009 Ford Ranger XL with a 2.3L. The stock tire size is P225/70R15. I would like to install the same size of tires the V6 Rangers come with P235/75R15. My concern is if these tires are to big and heavy for the 4 cyl engine. Will if affect my fuel economy? How do I calibrate the speedometer for the taller tire, can I change the speedometer cable gear and if so what gear do I replace it with? Thanks for the help.