Regarding peak speeds in record runs, the turbojet cars as I understand it have enough fuel capacity to run several miles prior to the times measured in the mile/kilometer, usually centered in the available length of the international course for example. They usually have reached their peak speed and are no longer accelerating to any great extent in the timed distances. Rockets are much thirstier for fuel and that is also a substantial portion of the total vehicle weight. As an example, The Blue Flame's strategy was to accelerate full throttle for 20 seconds, reaching the maximum speed and burnout in the middle of the timed distances. In our case that maximum speed was 660 miles per hour indicated in the mile/kilometer timing zone, and then coasting through with the timed speeds for the mile/kilometer at 622.407/630.388 miles per hour, two way average. We were not able to return with a refreshed rocket motor in 1971, at full power, due to contractual issues with the American Gas Association.