Fuel MPG in the 6.0 engine?

BigKahuna · March 29, 2015

That's 12.4mpg in US gallons. Not great but my 12 Ram w Cummins, 4.10 wasn't much better at those speeds.

rocnrol · March 30, 2015

You're right, but the truck is not even close to being broken in yet,to me it's looking really good.

BigKahuna · March 30, 2015

Yeah I wouldn't sweat it, I don't think anyone buys these trucks expecting to get good fuel mileage, especially at 75+mph.

Kent2500 · May 18, 2015

Wow, 16 is pretty good. Just got back from a round trip of about 100 miles one way. I got a little less then 16 on the way there and about 15 on the way back with a side wind. Both were driving about 71 MPH on the highway, rolling hills to flat ground.

With my 2015 2500HD Z71 4x4 6.0, stock tires, 65psi, averaged 15.7 on the highway. For a 400 mile day trip with some light mountain travel and a little local driving, 15 mpg average total. Weather a little rain, 55F. I'm a little heavy on the pedal and didn't use cruise control much on that trip (traffic)...

GMmaniac · May 18, 2015

I'm glad to get away from the " ECO TEC " engines and stay with a Vortec. I got better mileage with 2010 1500 CC, Z71, 5.3, 3.42 gears, towing package. However, more likely than not the ECO TEC would have been causing problems. I wouldn't compare the 1500 series to anything bigger either as HD models are so much tougher.

Thank you

Ken

Cowpie · May 18, 2015

Just ran from home down to St. Louis area today. About 100 miles of two lane to go stop and see friends in other areas, and then over to 4 lane (218/61) on down to St. Louis area. Some flat, but mostly rolling hills. The 2015 2500 6.0L did 17 mpg for that leg of this current trip we are on. Went thru several small towns on the two lane stuff that did the stop sign thing here and there, else not any real slow downs and such to eat away at mpg. Usually running around 65 mph. I am not much of a lead foot. This is part business, part vacation. I want to relax a little.

Edited May 18, 2015 by Cowpie

rv245 · May 19, 2015

I have a 10 2500CC and average 14 to 16 MPG, most running 2 lane roads and x-ways, hardly any town traffic. It was a 3:73 in it. I have seen over 17 a few times, depends on speed and driving habit. I have had Jason from BlackBear do a in person tune to it. I'm also running 89 fuel. I had a 02 2500CC before this one. I averaged around 11 - 12 with it, but then again it had a 4:10. I put a corsa exhaust on it along with a CAI and mpg improved just over a mile per gallon.

sahls01gmc · May 19, 2015

My 2001 sees about the same mileage even with the high miles! I can usually get around 13 unloaded, and 8 loaded.

Cowpie · May 20, 2015

Second day of the road trip to Memphis. Hand calculated last fill up and DIC is only high by .03 mpg, so darn near dead on. Only fuel put in is 87 E10.

Edited May 20, 2015 by Cowpie

KMK454 · May 20, 2015

After about 2000 miles, here's what I'm seeing:

15-16 MPG - perfect highway conditions (smooth, few hills, constant speed in 65-75 range)

12 MPG - around town, stop and go with some open road mixed in

10 MPG - calculated while towing about 8000 lbs over 850 miles

10 while towing gets interesting as your range on one tank goes into the mid-300 mile zone. That means more stops and more of a challenge planning for fuel (don't leave yourself searching for an open fuel station late at night!).

The several MPG advantage the 1500 enjoys will add up over a 5-10 year run, but when the cost of a comparable 6.0 2500 is about the same, it's hard to pass up the extra HD components. While the 5.3 and 6.2 are comparable or better than the 6.0 power wise, there's more to towing than horsepower and torque... all that does is get you moving. Towing vehicle weight, payload capacity, GCVWR, tongue weight, brakes, etc. don't get nearly enough credit when people talk about comfortably hauling in a fully loaded truck.

KMK454 · May 20, 2015

double post!

Edited May 20, 2015 by KMK454

BigKahuna · May 20, 2015

^^^ this.

Would like to see the dyno charts of the 5.3 and 6.2 up against the 6.0. Peak numbers are great but how are the curves? The 6.0 makes 90% of its max torque all the way down to 2000rpm. How much do the others make under 3000?

My 1500 w 6.2 has only done better than 19mpg once and it needs premium gas. If I can get 15-16mpg with my new 3500 I'll be pleased.

10mpg towing isn't that bad either, my 2012 ram/cummins was as bad or worse towing under 10,000lbs.

with my 1500's 26 gallon tank I sometimes get a sub 400 mile tank range too, all highway cruising at 65-75mpg with just a dirt bike or two in the box. If I tried towing 8000lbs I'd be looking for a gas station every 200 miles I'm sure.

Edited May 20, 2015 by Camstyn

Cowpie · May 20, 2015

Took some digging for a dyno chart on the L86 6.2L and am not totally certain I got the right one, but here it is. The best I can tell from the chart, the L86 gets ballpark 375 torque at 2000 RPM compared to it's 460 lb at 4100. that would be about 80% of available torque at 2000 RPM compared to the L96 6.0L getting 90% of available torque at 2000 RPM. Torque curve on the 6.0L seemed a little flatter overall as well. So the 6.2L would have 375 lb torque at 2000 and the 6.0L would have 342 lb at 2000. 33 lb difference. Obvious edge to the 6.2L, but not enough to hold the news wires for a special bulletin and throw babies in the air and celebrate.

2015 L86 6.2L

2015 L96 6.0L

Edited May 20, 2015 by Cowpie

BigKahuna · May 20, 2015

Thanks for finding that, the 6.2 is actually pretty impressive down low by the looks of that.

Cowpie · May 20, 2015

Yeah, it isn't a slouch. I wasn't interested in the 6.2L in the 1500, but that doesn't mean it is a bad thing. I got the 2500HD with the 6.0L more for the overall pickup and not just the motor. I have no regrets that I wasn't able to get the 6.2L in the 2500. And if they came out with it next year or two, I would still keep the 2015 I have now. This is the first pickup I have truly grown fond of since my '98 2500 with a 454. Each person has their own likes and needs. I am just glad there are many choices.