I just got my mid level LC and I had 13.5 on the drive home which was about 1.5 hours away. I forgot to reset it leaving the dealer. The last 30 minutes I switched to Eco mode and it jumped to 17. I topped off the tank today and I am at 18.4 now with a mix of city/hwy. Waiting for the break in period boost others have seen. I am on 18s with Michelin Trail tires with roof rails, but the cross bars are removed.