Tesco Club Card Points - Fuel

When I fill up the motorhome I use the Pay at Pump facilitiy as it it gives me more room to get in and out of the fuel station. What I have noticed that Pay at Pump seems only to give you half the points that a pay the cashier one does. To prove this I filled up the car a couple of days ago and went to a non Pay at Pump and selected pay at kiosk. Looked at my statement today and noticed one point for one pound. Next time I fill up the motorhome I will try and pay at the kiosk. Anyone else noticed this? Could make a difference for anyone saving for a Eurotunnel crossing.

David