[Copperhead]

Ya' know, this is all really sad. I had a '98 2500 with a 454 that averaged 15-16 mpg all the time. It had 4.10 diffs also. Makes me sad I ever got rid of it. Granted, it was primarily a rural pickup that only a small percentage was in town driving. Just a good all around pickup. It should be (but it isn't) embarrassing for GM that they haven't improved mpg on these vehicles in almost two decades.

 

[BANSHEE HP]

2003 1500hd 130k all stock 3.73 gear 12.6mpg. City/ very little highway/ dirt roads and 4x4 to get out of my driveway

 

[jimnfor]

Just got back from a round trip Houston/Dallas. By myself, cruise set on 70, the MPG was right at 14.9. Coming back I set the cruise at 75 going into the wind somewhat and the MPG was 14.5.
This is with 3.73 gears, long tubes, cats deleted and a tune.

 

[bedtwd]

I've been averaging 18 but that's driving speed limits and not getting on it.

Sent from AutoGuide.com Free App

 

[jake2250]

Well I am doing better,, 6.0 running E 85, I drive like a grandpop,,didn't have any where to be in a hurry,, got up early to get to work and i pressed the dreaded DIC button and looked at economy,,,,I was happy to see that i was getting 8.1!! WOOT!! Allot better that 7.1 pulling my 23 foot trailer!!

 

[Copperhead]

I was doing some digging around on the web and came across a number of papers where a study was done with a variety of vehicle brands and ethanol blends of E10, E15, E20, E30, E40 and E85. There was a mpg curve that occurred with various blends, with E20-E30 being a blend that exhibited virtually the same mpg as running non ethanol fuel in Chevrolet flex engines. I decided to give it a try on my week off vacation time this last week, since I have access to some retail blender pumps that have E30 as an option. I got virtually the same mpg as using regular 87 gasoline. But the cost was about $.30 a gallon cheaper. It is worth a try, if one can locate a blender pump near them.

 

[jake2250]

View media item 169514
Oh boy,, I did better on the way home!!

 

[rwhanson9986]

Wow, this is an old thread, but still gets some posts once in a while. After reading other posts, my 14.6 in mixed driving with my new 2014 2500HD sounds pretty good. Especially with a 4.10 axle. Am wondering if Mobil One oil will help at my first oil change.

 

[adam86107]

I get right at 13mpg with 3.73. How fast do you usually travel? Our speed limits are 75mph pretty much everywhere.

 

[jimnfor]

Wow, this is an old thread, but still gets some posts once in a while. After reading other posts, my 14.6 in mixed driving with my new 2014 2500HD sounds pretty good. Especially with a 4.10 axle. Am wondering if Mobil One oil will help at my first oil change.

The brand of oil used is negligible when calculating MPG.

 

[ddnova]

Just bought a 2013 2500HD with the 6.0l ,it was the dealerships demo and has 30,000 km on it. A recent trip I took I was able to achieve 16.25 MPG , thats mainly flat highway with some hills and cruise set at 100 kmh. the DIC computer is way off both on fuel used and fuel left. I know this is I set my 'fual used" to zero on fill up then when I refueled I compared the DIC to my original receipt and it was a difference of 20 liters. with those calculations the DIC tells me 13mpg which would have made it impossible to reach my destination before refueling.

 

[mudder.865]

I get 10 mpg loaded or empty, up hill or down hill, lead foot or light foot. Stock except for CAI and exhaust. I'm not complaining, it runs great, it's just thirsty.

 

[CGlinsbockel]

Hi,

I just bought a 2007 2500HD Classic Silverado. I have filled it up a couple of times now and the mileage is terrible. The first fill up was a mix of Highway and City, about 50/50, I got 9.82 MPG. The 2nd fill up was all city driving and i got 7.9 MPG. This is all with the truck empty, haven't towed with it yet. The truck has 170,000 KM's on it and i have no service records other than oil changes for it. Any recomendations of what I can do to hopefully get this thing up to 10 MPG city.

 

[jake2250]

Update on my mpgs,, still at 8-8.2, took the wife's car to the dealer for some work,, talked again to a different service manager and told him my mpg's, he tells me to expect 4-5 mpg difference in E85 compared to 89 oct. That's the highest figure I have heard yet..
I am bringing the truck in to the dealer next week to finally get one of my free oil changes and this manager said he will perform a complete performance test on my engine. He agrees that the mpg's seem low, but also added the fact that it's a truck!! (thanks Capt obvious),

 

[cory321]

I have a 2006 Silverado 3500 4x4 crewcab and I'm averaging between 11.5 and 12 mpg. Thats about 50/50 highway and city driving

 

[Rcard86]

Hand calculated i get 16- 17 on my 2013 and the display says 13.5 so idk

 

[Kredsand]

I have a 2012 sierra 2500HD and the best I've ever got is 10.7 mpg not even getting on it I usually avg 9.7 mpg

 

[coop923]

2003 2500HD doing rural driving daily gets me about 12.1 day in and day out over thousands of miles. Highway driving on a trip if I figure the mileage I have gotten 13.5 once. 4.10 gears probably don't help.

 

[brant2500]

ok a 2002 2500hd with 4.10 gearing 75% rural driving and 25% city im getting 11.9-14.7 i drive like grandpa according to my wife
but with that MPG i'm going to keep my foot light as i can

 

[fd39901]

i am getting 14.7 mpg