When you're At speeds of three hundred or greater 109s can't roll or pull up as fast as you can because they're fighting stick forces you don't have to contend with in a Jug. Your goal now is to make them burn energy while you try to conserve it.
Great general advice, but I feel it needs some clarification. 109's are all more than capable of fighting above 300mph, save for the 109E which is just kind of capable.... they're just not
as good at it. Point being don't deal in absolutes with the 109, or any aircraft for that matter; think "he
probably won't be able to follow this maneuver, but if he does, I'll do ____"
And as to the energy point, watch out for the K4. You'll need about 1 1/2 times the E advantage compared to the other 109's, and even then you should be a bit leery of him.
If you can work him into a slower scissor type fight you may have opportunities to force overshoots and get some shots on him before he can pull away. The thing about the M is it will hang on the prop longer than the other Jugs and surprise the unwary 109 pilot. Once it runs out of WEP though its just a D-40. The problem with 109s (especially the K-4) is a good stick will always maintain an advantage over a jug. If you run into an uber K-4 pilot, you'll rarely beat him unless he makes a mistake. The k-4 just has too much raw power for even the best jug pilot to overcome.
Can't over epmphasize the K-4 point. Theres a decent chance that, if he sees himself starting to overshoot, he could get away with shenanigans like just lifting the nose and climbing to safety with pure horsepower. Keep in mind he's putting out over 1700hp, he weighs only a little over 7500lbs, and has over 9 minutes of continuous WEP, which will strech to more like 15 or 20 minutes of intermittent use if he's smart.
While it's true the 190 has good high speed handling, it can't flat turn as well as a Jug especially when you incorporate the flaps on the P-47. *snip* The only 190 I fear in any Jug is the A5 because it usually an uber stick an it turns better than the other 190s.
Again, don't take that "as well" to mean that the 190 is incapable of flat-turning. Only one that is really incapable of turning at all is the 190F, but thats just because he weighs a hell of a lot more than the others. Though the odds of getting bounced by one is probably lower than the odds of getting bounced by a Hurricane Mk I. As Mak said, watch the A-5's; they're possibly the most dangerous purely in terms of the aircraft, and have a higher chance of being flown by an ace.
Oh, and again, don't let them get a crossing shot. They carry buckets of ammo for the 20mm, will be very liberal with the trigger if they get a good shot, and the A-8 carries two 30mm's. Even just flying through that will ruin your day.