mileage?

Photomike wrote:

Photomike wrote:
2002 GMC 2500 HD 6L gas and I get around 11.7, 11.9 on a regular basis. I get a lot better in the mountains 12 - 14. Would love better but honestly have not found it.

My brother is getting in the 40's with his big diesel when pulling a huge cargo trailer. I would love to put my camper on his truck to see what happens. I suspect that MPG would drop like a brick but would be cool to see.

Let me try again....

I have a 2002 GMC 2500 HD with a 6L that gets around 11.7 up to 11.9 mpg as an average on most trips, flat to the foothills.

In the mountains I get a lot better from 12 to 14 mpg.

Would love a truck that gets better MPG but have not found one and I have looked at a lot.

My brother drives a 3500HD diesel tricked out with all the toys and can get in the low to mid 40's pulling their large cargo trailer on the highway. I would LOVE to put the TCer on his truck to see what it does to the MPG, have a feeling it would drop like a brick.

Hope that explains it better.

You are saying your brother is getting 40mpg with his 3500 diesel pickup truck while towing??? Is that average, or just what the onboard computer is reading for instant mileage while going down hill with the wind behind him????