The only 6 I've had was in the XJ and it used to get around 18 city and 13 highway not towing a thing in a vehicle that weights hundreds of KG's less. Your figures sound fine.
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2003 Overland 4.7 HO: 2 inch lift, ARB Bullbar, IPF spotties, Warn 9000 winch, Rolla roof cage.
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