In Paris, premium is 35 cents higher than 87. So a 25 gallon tank, that's an extra 8.75 a tank. If you can afford to drive a 3/4 ton truck, you can afford the extra 8-9 bucks to run good fuel. As stated above, more octane means more timing, which leads to more efficient power that's relatively cheap. But if 8-9 bucks is too much, go buy you a Honda, I hear they're really cheap to drive.