I guess it depends on how much you care to know.
Some of the places to start -- Check the AH training links.
Heck, take a look at Andy Bush's articles on simhq.com (or his comments here).
You might also find useful some of the pages for WarBirds. I remember a long time ago reading Fletchman's description of energy fighting; if you don't want to read Shaw, that's a little more lightweight.
(who's Shaw you ask? Someone will be along to post the link to order his book from Amazon).
Anyway, the problem you describe might be helped by a study of the difference between "lead pursuit" and "lag pursuit". Type those terms into a search engine and see what you turn up.
First though, it's time to remember your high school physics: potential energy and kinetic energy. The faster you go, the more KE you have (and it's something like a function of the square of the velocity, so the energy difference between 100 and 200 mph isn't as much as 300 and 350). The higher you are, the more PE you have.
Second, think of your plane: it has an engine that generates energy (excess power) for you (if it's a prop, the faster it goes, the less power it generates), and it has wings that generate lift (and, generally speaking, the more lift, the more induced drag). Again, generally speaking, the more lift you generate, the more energy you retain in turns, but the more induced drag you generate, which often translates into a lower top speed.
what this means:
If you keep lining up for a shot on a bogey of similar performance, you will burn energy faster. A smart bogey can either (A) wait till you're well below maneuvering speed and reverse on your wallowing ass; or (B) perform some energy-efficient maneuver that takes advantage of your tendency to pull lead, draining you of energy and putting him in your rear quarter.
For example the one I use too much at the moment is the following sort of rolling scissors:
A bandit comes on my six and starts pulling lead. I effectively perform a large looping barrel roll through the sky. This huge corkscrew burns little energy, and lets me cover less distance at the same speed than if I had flown straight.
The bandit pulls lead, burns energy, and eventually sees me slide in behind him, with higher energy (=more potential for maneuvering) and a modest complement of cannons.
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To boil it down for you even more:
Don't pull for a shot at every waking instant. Hang back, follow behind the bogey, until the moment is right; then convert for the shot.
