its 3 miles a lap, 4-5 laps so 15 miles max in the session
half a tank will be plenty if your only doing 1 session
snetterton i did a full tank in 80miles

i will be making sure i am fullish

_________________________
Red Escort 1.6LX
Then - Red Escort 1.4
Then - Silver Fiesta ST 170BHP
Then - White Fiesta ST MR200+
Now - Mitsubishi Evo IV Forged 2.3 500BHP
and Mondeo Mk3 2.0TDCI