Hey guys,
I am having a major issue with my 04 IS300. The gas mileage has been horrific in the city compared to what it was getting previously. I have noticed a significant decrease of city mpg and I can visually see it going down tick by tick in maybe a fifteen minute commute from work. I used a up a quarter tank in one day, I think that is a bit excessive. My car is 59k mileage, but I thought spark plugs could have been an issue so I changed those with my timing belt, water pump and many other parts. I thought after changing my spark plugs everything would be fine again but it is not unfortunately. If anyone is having a similar problem or resolved this issue please reply back. Thanks in advance!