You may get cheaper at some schools, for example those which operate twinstars. But that is a different can of worms!
Not any more. At the school I'm at, the Twinstar is now £4/hr more expensive than the Seneca (TS - £350/hr PA34 - £346/hr) due to a rapid increase in maintainence costs since the demise of Thielert !!. The fuel surcharge is currently 30p/
min 
on the Seneca, although the price above includes that !!.
