ptmeyer84 Posted July 11, 2006 Share Posted July 11, 2006 Post your truck's model, gearing, performance upgrades and relative city/highway percentage. I would like to see just how much worse the gas mileage is compared to a 6.0L. Thanks Link to comment Share on other sites More sharing options...
moo snutz Posted July 11, 2006 Share Posted July 11, 2006 Hey ptmeyer84 - I get between 11 and 12 average with a daily commute of 30 miles (40/60 city/hwy). I've got 4:10s and 265/75s. On pure highway trips, I get close to 13.5 - not too bad at all. I just put on a TrueFlow air intake and didn't notice an increase in my daily average - probably because I get on it a little more now BUT I just got back from a 550 mile rnd trip camping trip down into the Navajo Nation in AZ with a 2500lb slide-in camper & got 11.5mpg !!! I normally got 8-9 with the camper. BTW - I live at 7000ft. Take it easy & welcome Link to comment Share on other sites More sharing options...
DSengineer Posted July 11, 2006 Share Posted July 11, 2006 I thought the 8.1 only came with 3.73 rear end. Are 4.10's an option? Link to comment Share on other sites More sharing options...
Daubs Posted July 11, 2006 Share Posted July 11, 2006 Good poll. I'm driving 04 CC 2500HD with Big Block / Allison combo. Have 3.73 gears and 285 REVO's. Started off in the 8.5-9 MPG range around town and 10-11 MPG highway. Changed intake to Volant cold air system. Got Westers tune and asked him to change spedo for tires and give me good MPG. Now I'm avaraging around 11-11.5 MPG city. And getting 13-14 MPG Highway. Only complaint I have is my engine has developed the cold start knock. Aside from that I'm very pleased with the Big Block. Loads of power and pretty darn good MPG for a 496 cid engine! Link to comment Share on other sites More sharing options...
ABQFirefighter Posted July 11, 2006 Share Posted July 11, 2006 4.10's are an option and I have them. Also, 295/75R16 tires, 4" lift and I get between 9-10 in town. Towing the 5'er, 6-7mpg. Link to comment Share on other sites More sharing options...
dewfpo Posted July 11, 2006 Share Posted July 11, 2006 12.02 mpg average since new (hand calculated not DIC, DIC reads high), 95% rural, no city, 5% highway. High Altitude. Bone Stock 8.1L 4x4 with 4.10's If I reset the DIC while on the highway and set the cruise at 65 mph I can break 14 mpg. DEWFPO Link to comment Share on other sites More sharing options...
dewfpo Posted July 11, 2006 Share Posted July 11, 2006 I thought the 8.1 only came with 3.73 rear end. Are 4.10's an option? <{POST_SNAPBACK}> Your thinking of the Duramax. DEWFPO Link to comment Share on other sites More sharing options...
Wirenut Posted July 11, 2006 Share Posted July 11, 2006 4.10's are an option and I have them. Also, 295/75R16 tires, 4" lift and I get between 9-10 in town. Towing the 5'er, 6-7mpg. <{POST_SNAPBACK}> 4" Lift and 295s I would have thought your 5er rear bumper would be draggin' on the ground Nice scenery in the background (PICTURE) 2001, 3500, 285s, 4.10 I get a tiny bit better than 11mpg on the highway. 7mpg towing my 11,400 fifth wheel. Link to comment Share on other sites More sharing options...
Cheekster96 Posted July 11, 2006 Share Posted July 11, 2006 2006 2500HD with the 4.10s. regular cab and 4x4. Got the six speed ally with it, awesome! Double overdrive gear is nice with the big block. I am not much in a hurry when travelling out on the turnpike..generally do 65-70 mph. I dont have the steering control buttons so i dont know the instant fuel mileage but after a fill up, i generally average 11.5-11.9 mpg. I dont tow. Truck just turned 2500 miles. Everything is stock. I did have to replace a tail light because it burnt out and that was about 200 miles ago. Later Lee Link to comment Share on other sites More sharing options...
rlarson Posted July 11, 2006 Share Posted July 11, 2006 11.5-12 for me on my regular daily comute 80/20 highway/city with an 04 3.73 gears and 265/75's only mod being westers pcm which made no noticable change in mpg (which was my biggest reason for spending over $500) Link to comment Share on other sites More sharing options...
Trouttrooper Posted July 11, 2006 Share Posted July 11, 2006 11-12 mpg empty 10-11 mpg loaded 4:10's Allison, crew cab, long box, 3500SRW My old truck....1999 GMC 2500LD 6.0, 4:10's, extended cab, long box 15 mpg empty 6-7 mpg loaded Since my truck most often is towing or hauling a load it actually makes economic sense to own the bigger engine. My yearly average mpg is better with the 8.1 then when I had the 6.0 Link to comment Share on other sites More sharing options...
linda Posted July 12, 2006 Share Posted July 12, 2006 Post your truck's model, gearing, performance upgrades and relative city/highway percentage. I would like to see just how much worse the gas mileage is compared to a 6.0L. Thanks <{POST_SNAPBACK}> 2003 ECSB 4x4 Allison trany whipple supercharger @6psi Dmax intercooler 4.10 rear / G80 I have no idea what i get for gas milage and i love it. Its gotta be single digits because i find my shoe getting stuck to the floor with the gas pedal underneath it everytime i go out on the road. Its like my foot is made out of lead or something...LOL Link to comment Share on other sites More sharing options...
Shooter_va Posted July 12, 2006 Share Posted July 12, 2006 I get between 10 and 11 average around the area I live, 12 to 13 Hwy and 8 to 9 towing my 10k lbs 5er. I've got 3:73s and 265/75s on my 2001. Link to comment Share on other sites More sharing options...
Bart2500HD Posted July 12, 2006 Share Posted July 12, 2006 I get between 10 and 11 average around the area I live, 12 to 13 Hwy and 8 to 9 towing my 10k lbs 5er. I've got 3:73s and 265/75s on my 2001. <{POST_SNAPBACK}> Shooter, How fast do you drive pulling your 5er? My 5er is about the same size and our trucks are basically the same, except I have an extended cab and 4.10's in it. I usually pull at about 65mph with the tow mode on and never get higher than 8mpg towing. Of course where I tow there are hills and I usually have to fight the wind too. Link to comment Share on other sites More sharing options...
dco111 Posted July 12, 2006 Share Posted July 12, 2006 I have a 03 3500 crew cab with duals. Before the wait 4 me I got 5-6 pulling 9-10 empty, after 8-9 pulling and 12-13 empty. I have a 28' fifth wheel weighing around 12000. I run anywhere from 65-80. LOVE that tune. Link to comment Share on other sites More sharing options...
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