I got some updates knowledge about driving without re-fueling:
By driving without re-fueling at 100% race, I had to increase the magic data +2500, +3000(depending the circuit): 70-player Fuel Consumption, 71-AI Fuel Comsumption.
If we dont change it, there gone left 15, 20 fuel laps.
Maybe could René, made an upgrade in gpxpatch. I dont know if its possible.
If we see back at the turbo era, there was lot of races where the cars got out of fuel at the end. In gp4, an human driver its easy to save fuel, unfortunately the AI dont know how to do it.