Quote:
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Originally Posted by Brian Carlton
Navy, the change in tires will only offer 7.8%.
A 185-70-14 tire has a diameter of 24.2
A 205-75-14 tire has a diameter of 26.1
Engineers..........   |
Key word here is
about.
Man Brian give an old fart some credit for guessing.
Sorry I just guessed as I had to run and do something at the time. The 15" rims would probably get him in the range he's looking for, but
that's a guess Brian. 
My guess is the cost of this change would probabley take average person 10 years to recoupe in fuel savings. If it was me I would do the 205 or 215 jump in tire size when it comes time for new tires. 195/70 was biggest on US cars from MB and those had alloy wheels, lots of dealerships upgraded them from hubcap style at buyers request to the alloys with larger tires.