So my ‘13 plate RX450h needed a new 12v battery the other day, the Ready light kept refusing to come on intermittently. Took it to my local dealer, new battery fitted, the old one wasn’t holding much charge apparently. All good. Except it’s not. My mpg is suddenly shocking. My mixed driving before saw a 33-34mpg average. Now it’s 23-24. I’m driving no differently, have checked all my car settIngs before the battery change are the same now (eg not in eco mode but normal), yet no matter how saintly I drive, I can’t get above 24! What’s happened?! I’ve noticed that I rarely get the car to stay in battery only mode when setting off - the slightest touch of the accelerator makes the power needle go straight through the blue zone of the dial into the economy and power sections. Something can’t be right can it? Any ideas folks?... thanks!