Hi OneAndOnly - use the following code which will display the spread for you (i.e. the actual difference between the Bid and Ask price in the back-tester):
Print("Bid: " + DoubleToStr(Bid, 5) + " Ask: " + DoubleToStr(Ask, 5) + " Calc spread: " + DoubleToStr(Ask-Bid, 5) );
Regards.