It would be nice to have the advertised, 4.2 gallons. However, 3.7 gallons is still a nice quantity of fuel. I ran out of gas once, and the trip odometer read about 255 miles.
I average about 68 mpg. You should leave about 1/2-gallon in the fuel tank to prolong the life of the fuel pump. Therefore, I know I can ride about 210 miles before I refill the fuel tank. That's a pretty good range.
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Spud
"Never argue with an idiot. He will drag you down to his level, and beat you with experience."
Mark Twain
2015 Zongshen ZS250GY-3 (RX3)
2006 Zongshen ZS200GY-2 (Sierra 200)
2005 Honda XR650L
2004 Honda CRF250X
1998 Kawasaki KDX220
Mods made to my Zongshen ZS200GY-2:
http://www.chinariders.net/showthread.php?t=6894