chains and sprokets

Rite could any one tell me about chainging teeth on sprockets my bike as standard has 16 teeth on front and 44 teeth on rear (might have to check that) i want 17 teeth on the front as i would like better MPG but on the back sprocket could i allso take a tooth away or add one to make this better there is a small difference after changing the front as i'v done it before my bike currently has 14 or 15 theeth on front i havent counted but i know its less teeth because of rev's bike show . am i best changing front or back or both i am getting new chain and sprockets so now's the time to ask at the moment i was just getting front sprocket one tooth more hopefuly any one who used to ride sports bikes or moto cross may be able to help

1 tooth either up or down on the front is equal to 3 teeth on the rear.

so one tooth on the front should be good enough then to give a bit more top end drop rev's and give a little more MPG?

You got it.

great i'll get on that thanks mate