My stock tires are 225 / 50R17. I want to increase the profile to decrease the amount of tire on the ground to get a little more fuel efficiency out of my vehicle. I did the equation and found two alternatives: 190 / 60R17 and 175 / 65R17. However, I've only been able to find these tires in motorcycle tires. Anybody have any info for someone who is wanting to increase the profile on their tire?

My stock tires have a diameter of 25.85".