fuel milage

[banshee42096]

okay i have a 2004.5 gmc 2500hd d/a cc i noticed since its

been getting colder here that my fuel milage is declining.

at the very least about 2-3 mpg is it just the winter blend

fuel or what i do start it and run in the morning but i cant

see that much of a diffearance.also i took one long ride that

took 2 tank fulls and still the same result should i just take to dealer

and have them tell me nothings wrong i only have 10000 miles

on the beast now any help

[kjjz28]

Banshee,

 

I wish I could provide some valuable info but I just picked up my '02 GMC ECSB D/A in the Chicago area over the weekend and drove back to Texas and my best tank was 21.9...I couldn't believe it. It was great! Granted, the truck has 85k miles on it but I'm not sure if the blend this time of year makes a diff or not. And yes, that Allison transmission is awesome!