Is all diesel created equal?

[boozinag]

I went on a long highway trip (about 150 miles) and my mileage has been around 13mpg. Normally I get around 15 IN town. That seems like a sharp cutoff. Especially for a highway trip.

So is it the truck? Or is it because I bought the cheapest diesel I could find?

Also, I did not put diesel kleen in this tank, which I normally do, and my truck has 3.55s

[JSchuricht]

Kinda unlikely in TX but if you managed to get #1 diesel you would get 2-3MPG less than #2. It's hard to say with just one tank of diesel, just check your filters for now and if the mileage continues to suck on the next tank then start looking deeper for issues.

[boozinag]

Well I fueled up at a Valero for 3.69, most other places in town were at 3.79-3.89, so I was wondering if there was a reason for the price difference.

[vandy]

idk what to tell ya. i almost exclusivley use valero and get around 19-20 mix city highway...

[BigFuel]

Also, as filling stations move to winter gas you will see a decline in MPGs.