Yeah do like Aterlatus says and do the Dual Tank mod.The pickup on the Savage fuel tank is in the front of the tank.At half tank the fuel is pushed to the rear of the tank and the pickup can't get any fuel and causes the cutting out at high speed.Look into the tank mod or wait until October when HPI releases the Savage25 RTR.The new 25RTR will have a tank with a rear pickup and no primer so it will be a much better design and should solve many problems.