The computer sees how much is in the tank and monitors average MPG over the last 10 or so miles and does a distance to empty calc based on that. My low fuel light comes on when there is about 80 miles range remaining on the trip. My car gets about 560 miles to a full tank when driven pretty carefully in decent weather conditions.
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2014 Skoda Octavia vRS with loads of toys!
ex 2012 V50 1.6D DRIVe SE Lux, 2008 XC70 D5 AWD SE Geartronic, 2004 S40 2.0D SE, 2008 C30 1.6 S & 2000 C70 2.0T 
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