My 2007 LC sees nothing but short hauls around the city. MPG has always been in the 11.5 range but I never thought much of it since it was all stop and go. Yesterday I drove 200 miles on the interstate and only got 13 MPG?? All my basic service is up to date and my car has no special mods except for +1 tires on an otherwise stock setup. Any thoughts on what may be going on here? Others are reporting 16+ MPG on the highway. Thanks!