What your mileage on stock engine?

[EL TATE]

Originally Posted by bpe1

I would bet if you hand calculate it and you'll be disappointed.

i have, it's almost dead on, give or take 1/2 a mpg.

[bpe1]

Must be a big improvement in the newer models. Mine really lies. I have seen 19 dic reading on interstate and actually got 14.8 hand calculated. Speedo is accurate.

[floridamax]

I get about 14 in the city and 18 19 on the highway but with the regen it always drop my whole average to exatly 14.5 mpg on every tanks.

[EL TATE]

i use the cruise control on the freeway always, and really keep my foot out of it. we're sitting at $2.89 per gallon for decent fuel.

[Drachir]

I did a hand calculated 17.6 mpg last weekend on a 250 mile trip, running empty. We have a 9000# Travel Trailer and get 11-12 mpg towing. My truck is totally stock, and I'm ecsatic with these numbers. They are far better than the 04' Dodge 2500 QC w/ a 5.7 Hemi I had before this Awesome Chevy HD. In fact, my Dodge only got 11-12 mpg empty and 4.5-5mpg towing the same Travel Trailer. Not to mention the gutless nature and lack of torque that the Dodge had.
I Love My Chevy 2500HD Duramax/Allison!!!

[tatca]

Originally Posted by Michael1

I've searched the forum, but only found a comment here and there for an unaltered, stock engine with all emissions equipment. I was wondering if some people could share their city and highway mileages (and speed on highway) unloaded. I checked Consumer Reports, and their mileages for the Silverado 2500 Duramax were 9 and 21 (no speeds given).

Thanks.

Michael

I have a 2005 crewcab, short bed, 4X4 all stock. my unloaded mileage is 20-22 MPG driving 60-65 in rolling terrain. I tow a 10K-11K pound 5th wheel and average 12MPG driving 60MPH in rolling terrain. In flat interstate conditions, my towing efficiency increases to 14MPG. In mountainous conditions, efficiency deteriorates to 9-11 MPG.

Terrain and wind conditions, as well as your driving style, will have a significant effect on efficiency. You should also check your tire pressure. I operate my truck and 5th wheel at max recommended pressures: 80-psi in trailer and truck rear wheels; 55-psi in truck front tires.

tatca
2005 LLY, crewcab, 4X4, all stock

[BUBBA3M]

2006 LBZ

Overall miles..........48k.
City avg mpg's........15-17 empty
Highway mpg's........18-22 empty @ 60mph

Loaded with 30ft 12000lb 5th wheel

Highway mpg's........10-12 @ 60mph

All ratings are hand calculated.

[RocTrac]

Last trip from Houston to Ft Worth got me at 19.5mpg (hand) driving about 75 most of the way.

[Charles Perry]

'09 3500 ext cab dually, 4k miles total - trip from SF, CA to Spokane, WA to Butte, MN-GCVW=24k all towing @ 60mph on cruise where possible =10.5 mpg. The truck is strictly stock.

[HZahorik]

With my LB7 that's stock except for a drop-in K&N, I get 21 all around which for me is about 95% highway.