Exactly Skurj,
This is going to depend a great deal on what you are flying, and how it compares to what the attacker is flying.
But, the bottom line is this. If the other guy is a good pilot in a comparable plane, you can't expect to beat him starting at a disadvantage. You can try all kinds of things... but you never want to begin a fight from both a positional and energy disadvantage such as you describe. If your plane has the speed and diving ability, simply split-S and bug out for friendly territory.