Jim,

Thanks for confirming my suspicions that the size of tires from different brands, although they are "listed" at the same size, do vary. I have definitely noticed better pickup and fuel economy when I swapped out my Yoko Avid H4s to the Michelin MXV4s. Don't get me wrong, the Avid H4s are great tires at a fantastic price, but I personally don't think they work best with the W123 bodies.

Also, Jim, you're right on about the W124s getting better mpg compared to the W123s. I always thought that the better mpg on the W124 was due entirely to a more efficient engine. He correctly points out that the W124 body is more aerodynamic ( less coefficient of drag) thereby saving diesel.

Happy clickity clattering!