Another item to consider is the octane rating. I know in the states you can still buy 85 octane, which is no good in a hemi. Hemi's are recommended to run on 89 octane with 87 being acceptable. Once to really start to work them (especially in hot temps) 87 won't due. The ECU will retard the timing to prevent knock, costing you up to 30hp. When I tow in hot temps I run 91 octane without any loss of power.