Yep. I have quite a bit more of a hit on MPG, but that's more due to the cam LOL.It seems to be about 2-3mpg less in the city, depending on how you drive it. Hwy miles is probably 1mpg less, or none, also depending on how many miles can you go with the verter locked, the longer the clutch is locked in 6th gear cruising, the less mpg she'll loose, so you shouldn't see the difference in the freeway, in the city though, you'll notice it.