Smooth. Just drive smooth. Save your tires. If you feel like you're running out of fuel, don't shift below 4th gear, and try to keep enough fuel in the tank to keep the car's top speed above 80 km/h.
However, I seem to remember pitting every other lap, for fuel, because it creates less stationary time. Most times, the gap to the other drivers can change drastically, pending their fuel/tire strategies. Don't race their race. Race your own race.
I challenge you, actually, to make it interesting, by seeing whether or not you can run 5 laps in a row, to the very same second. For example, a reasonable lap time in my Evo X TC Nürb 4Hr. was 10:20.xxx. I ran that lap time for 6 consecutive laps. It was 2-3 seconds slower than the Amuse S2000 on fresh tires, but it was a second per lap faster than the same car on worn tires. We stayed neck-and-neck the whole race. In the end, a little bit of smart driving on the last lap saw me win by about half a second. I ran my own race, up until the final, closing stages, when I double-stinted on the same set of tires, and the results showed.
