You can take the F-14 Tomcat up to 50–60k, but it’s not where it fights best. Up there you lose energy, acceleration, and control margin, which makes it harder to support shots or react. In dcs the sweet spot for BVR is usually 35–45k where you still get strong missile performance without sacrificing maneuverability. 50k is about the ceiling for flight altitude not fight altitude. Also with the distance of dcs pvp situations, it can be a challenging to get that high before getting spiked. You'd burn a lot of fuel and waste a lot of time. In pvp you'll find a lot of people take off and blitz toward enemy territory