I live in So.Cal and have been making bio for 2-1/2 years and have 62K running 100%. It doesn't have quite the power as evidenced on a dyno but I have found that when I have to haul a load then I just mix 25% dino in the tank and the power is back. Mileage is about 1mpg better. Had to have the turbo cleaned and my mechanic and the dealer told me that usually happens between 100K and 125K, mine was at 155K. Other than that, no problems.