Hi im a bit thick sometimes I have a el falcon should be running 215/65/15 and i brought two wheels and tyres to replace damaged rims (alloy on pott hole) which also destroyed tyres and the tyres on them are 215/70/15 how far would the speedo be out

have look at this,
documents.php?d=30

Many thanks The old el has done 1,190.000 ex taxi and delivers pizzas so drop 5 k and all good