I noticed this past weekend that i got really really bad gas mileage. I drove the whole tank on the highway and only got about 210 miles on the tank. What the h*ll is wrong?? Would a clogged cat effect the mileage at all. Any ideas from anyone?!?!?! Thanks in advance

 

no codes? correct air preasure in the tires, tune up good? check the cat , not hauling around a box full of tools?

 

Didn't have anything in my car. not even my subs at the time.

 

Check your timing and your cat........Usually one of those 2.

 

O2 sensors will have a big impact on gas mileage, too. I think the recommended service interval on those is like 24k miles or 24 months.