[Gone2]

I have researched and know that larger skinny tires tend to improve highway fuel economy; however, my curiosity is how practical this is tire upgrade on an automatic transmission vehicle. I currently have the 215/60r16 installed and am looking at either the 225/60r16 or the 205/65r16. The car is a 2000 Ford Taurus that all other aero mods attempted so far have yielded no result. The only things that worked were properly inflated tires and a modified p&g style while leaving the car in drive. Sorry, just wanted to give a quick history to apply to this tire question. I am concerned the increased tire size will yield no result, or a negative one.

Thanks