I am not having any drivablity problems that I have noticed. Startups are quick and easy, and I never have problems like stalling or hesitation. I have noticed a sharp decline in miles per gallon (got 10 on my last fill up, but I think most of that was due to the fact that I left the car with my mechanic for a few days and when I got it back the tank was down 1/4 (5 gallons) and the car only had 10 more miles on it.)