I get around 8.0L/100km highway and 100% city driving I can muster 12L/100km without taking it easy on the throttle. It's fairly good overall, I use the auto/stick selector quite a bit as well to try to keep the engine on boil for whatever might arise. The 3.5L V6 holds its own. I try to keep rpms in town around 2400-3500 as it seems the engine is in it's glory. I've never really checked to see what my engine turns at 110km/h, but I rarely drive it over that.
'11 Ram SXT 4x4 quad cab - 5.7L V8; 128,200kms
'09 Malibu 2Lt 3.6L - 140,000kms purchased 1 March 2019
'06 Pontiac G6 GT - 3.5L V6; 162,000kms (rear ended 15 Feb 2019, and given totalled title by insurance)