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Horrific Gas Mileage


HunterXRen

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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!

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So how bad is the gas mileage your referring to? Did you pull the 02 sensors and check those also? What about your fuel injectors? Do you have any codes or a cel?

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  • 3 weeks later...
  • 2 weeks later...

What kind of plugs did you use?? Iridiums are required for the 01s - probly the same for yours. Go to the dealer for any parts for your car, in other words...just a possibility if you let a friend do your plugs he might've used platinums which will change how the timing works. This in turn can affect mileage

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