Rollodus

I bought my 2006RX 400H at 77000 miles last year. It was november last year and the best MPG was 26 highway and aroudn 25 MPG city, have to mention that around city have to drive as a grandma to get 24 -25MPG, NO MORE THEN 5 MILES OVER THE SPEED LEIMITS, eventually 5 miles less. I did the ISC reset by myself and it seems to help a bit. Now it's usmmer time and in Atlanta you ned the AC on at all time, the MPG is terrible; 16-17 mpg city and around 23 highway. I took the car to the dealership and OF COURSE it was "in great" shape. After finding the ISC Lexus oficial procedure, took the car in again, and after a day and a half I got my car back allong with few pages of data showing that the car it's fine and the ISC/learning is complete.On short, nothing wrong. Anyone some advices?? I think I have a "lemon car" Is there any test for battery capacity?I suspect the battery. Thank you in advance.