So my 99 Durango got out of the shop a few weeks ago. The control arm had popped out and i needed new front shocks.

When i got it back, i could tell the MPG had dropped. It runs fine, just something is off and I can't tell what. I took it in to get an oil change about a week later, Mobile 1 full synthetic, new Spark plugs, and a new battery. Tire pressure is all the same as before it went into the shop.

I can't seem to find anything different that should be affecting it. My driving habits have not changed. I work at a pizza shop doing delivery in town and the country. I was getting around 14.5-15.5 average. Now every fill up, about 6 so far, have been 14 or lower.

Any ideas would be appreciated.

 

Winter gas mabey? I know any rig I have ever had drops mpg during the winter months because of the crap gas we get...

 

yea winter gas will do that to ya, not sure when they roll out the winter blend tho(id guess it depends on the area you are in)

 

Front end alignment could be off as well. Tire scrub will kill your gas mileage quickly. I had mine aligned incorrectly once by a shop and my mileage dropped ~2 mpg as well as killed the tires.

Bob

 

Thanks guys. It might be the gas. I live in Ohio so they might be getting different gas now. The alignment seems fine, but i'll keep an eye on it.

 

They could have played with a Pre-CAT O2 sensor and that would cause it.