been looking at this with interest....
I have an F-sport, with 15.5k on the clock now in 10 months.
I live in Milton Keynes and spend 2- 3 days a week working at home with the odd short journey around town..
It's a killer on MPG as it's 70mph dual carriageway for 1/2 mile then a roundabout.. repeat, repeat, repeat....!
I also head into london a couple of days a week and do the M1, North Circular and then back roads into the office..
I'm surprised by some of the mpg figures being quoted also..
Around MK i get around the 40 mpg mark.... when i'm on the motorway consistently higher bringing my average to 48-52 in the summer, and 44-48 at this time of year.
Interestingly if i fill up on my way out of MK into london i often get between 58 and 62.. 64 is the highest I've seen on arrival at the office..
I've done the brim technique and my on-board reading is very accurate, maybe 1-2mpg overstated tops.
I'm no angel but tbh in commuting hours the cruise control is set to mid 60's as it's difficult to achieve more than that anyway!
My car is almost permanently in eco-mode, apart from the odd flip into sport when i want an overtake out of the way..
after various BMW's and Merc's this is my first Lexus and i absolutely love it..
Andy