I'd appreciate it if IS300 owners would post the average Miles Per Gallon you have been getting in your vehicle. I'm in the market to purchase one, however the low reported MPG (18 city/23 highway) is a concern.
FYI: the heavier Lexus GS300 lists a better MPG than the IS300. How could this be if they share the same powerplant and the only major output peformance is the slightly more restrictive exhaust in the IS?
FYI: the heavier Lexus GS300 lists a better MPG than the IS300. How could this be if they share the same powerplant and the only major output peformance is the slightly more restrictive exhaust in the IS?