I have them in my 451. After 215+ passes in 1.5 years, no oil consumption. So far so good.
Ok so 215/4 = 54 miles give or take. Not enough mileage to really be able to tell. I have customers that put on 500-600 kms in a day road racing and driving to and from the track. You know what? They are down over a quart in that time period. J.Rob