Just an FYI, wkjeeps.com list the 05-10 tank as 21 gallons. Your fuel light comes on with about 4 gal left in the "reserve". This reserve is used to cool the fuel pump. I am not a mechanic or claim to be one, but my guess: if you are on the freeway and driving and the light comes on, you don't have to panic. I have pushed my wk for about 30-35 miles past to get to the exit I wanted. My wk still rides like it always did.
And as for the filling all the way up not being "Green". Most on here have lifted Jeeps, with 4.7 or higer engines. Last I checked this isn't a mini cooper site
THE WK BLUE CREW #14
MODS: CUrrent: ome hd (front and rear stacked), piaa lights, 275/70/17 silent amours, xd 17" rim 5.3bs, overland wood trim/steering wheel, kenwood dnx7100 nav, 800 watt power inverter in boot, 4x guard side rails, wh rear bumper, 08+ face lift w/hid's, front tow hooks
For Sale: Saguaro wk00 front winch bumper, pm me for details