Originally Posted by roderunner
Interesting statement. Aside from Ford EPA mileage claims, where does this information come from (specific reports, studies, etc.)?
some people on here used 16s with aero covers for winter wheels after using 18 Ti wheels and saw a 4 or 5 mpg improvement. But it makes sense, smaller wheels weigh a lot less. more air and less aluminum and rubber. Also the smaller wheels are narrower so less surface area touching the ground to steal momentum.