U're right, just already filled up the V-Power racing. I don't feel any powerup but it costs me 1.67 per liter.
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Heres a couple of links that might be of interest V- power all the way
http://www.youtube.com/watch?v=0QGCYLwTCGI
http://www.thorneymotorsport.co.uk/t...s_Update.shtml