Slow loss of mpg

[Talon]

I have a manual ALH Jetta wagon that I've put about 160k miles on. I've noticed that over that time I have gone from 49 mpg by the tank full to about 42 mpg. I drive the same places each week with the same driving style. Any suggestions on what to check?

 

[Nero Morg]

I'd start here. It's probably one or more things listed here.

tips for fuel economy

I've put this together in an effort to help some folks diagnose what may be a loss of fuel economy (MPGs) with their TDIs. Keep in mind, many of these items can work against your car in concert to add up to a sizeable increase in fuel consumption over time, so please don't dismiss any one item...

forums.tdiclub.com

 

[Talon]

Thank you sir. I'll look into the items you outlined in the article.

 

[TPW]

Sub zero weather and number one diesel will lower MPG's a little bit. I notice mileage drop when my engine doesn't get up to temperature.