any idea what kind of gas mileage to to expect? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

lurch115 · 04-21-2012, 10:20 AM

i am looking at an 2003 2500HD 2wd extended cab long box with the 6.0 L and and automatic transmission and was wondering what kind of gas mileage other people are getting. i have not been able to find anything online giving me rough ideas even.

Vintage Windmills · 04-21-2012, 01:34 PM

I can give you numbers for a 4x4. What rear gears and are you towing and if so how much? I'd think you could add 1-2 mpg for a 2x4.

Can't kech me · 04-21-2012, 09:19 PM

the biggest thing we need to know is what rear gears does it have?

Sierraslt03 · 05-07-2012, 08:12 AM

I drive a 2003 Sierra SLT 1500 HD Crew cab 4x4 6.5 box with a cap on and I get 12.3 miles per gallon

67ChevyRedneck · 05-07-2012, 09:33 AM

I've seen this a lot on other forums. Expect 12-13 around town and 15-16 on the highway (all unloaded). There didn't seem to be much of a difference for 2 or 4 wheel drive. For comparison my 5.3L z71 averages around 14 and I get 17.5-18 on the highway.

Tyler212 · 05-08-2012, 06:07 PM

I have a 2004 Silverado extended cab 2wd 5.3 automatic it has 3.73 rear gears and I get about 17-18 mpg city. I've not had it on the interstate yet.

lurch115 · 05-10-2012, 05:06 AM

thanks to everyone that has replied to this thread, but I decided not to get the truck that i originally made this post for. I instead bought the truck in my signature.

Vintage Windmills · 05-10-2012, 09:44 AM

Congrats. I have the same thing but 2001 and a 2500hd. I am looking into a Blackbear custom tune, reportedly nets 1-2 mpg improvement.

lurch115 · 05-11-2012, 03:43 AM

I'm planning to do some fuel milage modifications here and there through this summer. This weekend i plan on putting the E3 spark plugs in, because about a month ago i put a set in the wife's car and it picked up 5 mpg. So we'll have to see what kind of gains i get out of them in this truck. I'll try to keep everyone posted.

usmcchevy · 05-11-2012, 11:32 PM

Please do not put E3's in anything. They are a complete gimmick and cause nothing but trouble. Stick with normal AC delco's.

lurch115 · 05-21-2012, 04:47 AM

Quote:

Originally Posted by usmcchevy

Please do not put E3's in anything. They are a complete gimmick and cause nothing but trouble. Stick with normal AC delco's.

I have actually been running a set of E3's in my wife's car for a couple of months now and had no issues what so ever.

I actually had to change plugs and wires due to a light miss that was developing and went ahead and put the E3's in. I've already noticed almost a 4mpg gain.

Vintage Windmills · 05-21-2012, 09:58 PM

That gain is probably not due to those plugs but the fact it doesn't have bad/worn out plugs in it and miss anymore. Compare your mpg with the E3's to any other new plug and I doubt you'd see any difference. Either way good luck and keep us posted if you do net mpg improvements in the 1500hd.

clinebarger · 05-22-2012, 12:12 AM

Quote:

Originally Posted by Vintage Windmills

That gain is probably not due to those plugs but the fact it doesn't have bad/worn out plugs in it and miss anymore. Compare your mpg with the E3's to any other new plug and I doubt you'd see any difference. Either way good luck and keep us posted if you do net mpg improvements in the 1500hd.

Well said!

Sierraslt03 · 05-22-2012, 07:13 AM

Can anyone tell me if the G-Force performance ECU chip will help me get better gas mileage on my 2003 Sierra 1500 SLT HD Crew cab 4x4 with 6.0 liter engine. I presently get 12.3 miles per gallon average economy.
I have a fiberglass cap on this truck.! 6.5 box.

04-21-2012, 10:20 AM	#1
lurch115 Registered User Join Date: Oct 2006 Location: iowa Posts: 722	any idea what kind of gas mileage to to expect? i am looking at an 2003 2500HD 2wd extended cab long box with the 6.0 L and and automatic transmission and was wondering what kind of gas mileage other people are getting. i have not been able to find anything online giving me rough ideas even. __________________ "Horsepower is how fast you hit the wall, torque is how far you carry the wall with you." '84 chevy half ton short box 2wd, 67,000 actual miles '03 chevy 1500 HD crew cab 4x4 standard box, 6.0L

04-21-2012, 01:34 PM	#2
Vintage Windmills Vintage 4x4s Join Date: Sep 2010 Location: Prior Lake, MN Posts: 4,305	Re: any idea what kind of gas mileage to to expect? I can give you numbers for a 4x4. What rear gears and are you towing and if so how much? I'd think you could add 1-2 mpg for a 2x4. __________________ 67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore ) 86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6

04-21-2012, 09:19 PM	#3
Can't kech me Registered User Join Date: Jun 2010 Location: Longview, TX Posts: 222	Re: any idea what kind of gas mileage to to expect? the biggest thing we need to know is what rear gears does it have? __________________ "As I walk through the valley of rice i fear no honda, for i have torque!" My truck>http://http://67-72chevytrucks.com/v...d.php?t=418618

05-07-2012, 08:12 AM	#4
Sierraslt03 Registered User Join Date: May 2012 Location: Canada Posts: 11	Re: any idea what kind of gas mileage to to expect? I drive a 2003 Sierra SLT 1500 HD Crew cab 4x4 6.5 box with a cap on and I get 12.3 miles per gallon

05-07-2012, 09:33 AM	#5
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Re: any idea what kind of gas mileage to to expect? I've seen this a lot on other forums. Expect 12-13 around town and 15-16 on the highway (all unloaded). There didn't seem to be much of a difference for 2 or 4 wheel drive. For comparison my 5.3L z71 averages around 14 and I get 17.5-18 on the highway. __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications!

05-08-2012, 06:07 PM	#6
Tyler212 Registered User Join Date: Oct 2008 Location: Morehead, Ky Posts: 31	Re: any idea what kind of gas mileage to to expect? I have a 2004 Silverado extended cab 2wd 5.3 automatic it has 3.73 rear gears and I get about 17-18 mpg city. I've not had it on the interstate yet. __________________ 1968 Chevy C10 1998 Suburban My Truck

05-10-2012, 05:06 AM	#7
lurch115 Registered User Join Date: Oct 2006 Location: iowa Posts: 722	Re: any idea what kind of gas mileage to to expect? thanks to everyone that has replied to this thread, but I decided not to get the truck that i originally made this post for. I instead bought the truck in my signature. __________________ "Horsepower is how fast you hit the wall, torque is how far you carry the wall with you." '84 chevy half ton short box 2wd, 67,000 actual miles '03 chevy 1500 HD crew cab 4x4 standard box, 6.0L

05-10-2012, 09:44 AM	#8
Vintage Windmills Vintage 4x4s Join Date: Sep 2010 Location: Prior Lake, MN Posts: 4,305	Re: any idea what kind of gas mileage to to expect? Congrats. I have the same thing but 2001 and a 2500hd. I am looking into a Blackbear custom tune, reportedly nets 1-2 mpg improvement. __________________ 67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore ) 86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6

05-11-2012, 03:43 AM	#9
lurch115 Registered User Join Date: Oct 2006 Location: iowa Posts: 722	Re: any idea what kind of gas mileage to to expect? I'm planning to do some fuel milage modifications here and there through this summer. This weekend i plan on putting the E3 spark plugs in, because about a month ago i put a set in the wife's car and it picked up 5 mpg. So we'll have to see what kind of gains i get out of them in this truck. I'll try to keep everyone posted. __________________ "Horsepower is how fast you hit the wall, torque is how far you carry the wall with you." '84 chevy half ton short box 2wd, 67,000 actual miles '03 chevy 1500 HD crew cab 4x4 standard box, 6.0L

05-11-2012, 11:32 PM	#10
usmcchevy Has more rust than truck... Join Date: Apr 2005 Location: Ivanhoe, MN Posts: 2,421	Re: any idea what kind of gas mileage to to expect? Please do not put E3's in anything. They are a complete gimmick and cause nothing but trouble. Stick with normal AC delco's. __________________ 1972 Custom/10 SWB, 4.8/4l80e Build thread LSx Swap FAQ index

05-21-2012, 09:58 PM	#12
Vintage Windmills Vintage 4x4s Join Date: Sep 2010 Location: Prior Lake, MN Posts: 4,305	Re: any idea what kind of gas mileage to to expect? That gain is probably not due to those plugs but the fact it doesn't have bad/worn out plugs in it and miss anymore. Compare your mpg with the E3's to any other new plug and I doubt you'd see any difference. Either way good luck and keep us posted if you do net mpg improvements in the 1500hd. __________________ 67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore ) 86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6

05-22-2012, 07:13 AM	#14
Sierraslt03 Registered User Join Date: May 2012 Location: Canada Posts: 11	Re: any idea what kind of gas mileage to to expect? Can anyone tell me if the G-Force performance ECU chip will help me get better gas mileage on my 2003 Sierra 1500 SLT HD Crew cab 4x4 with 6.0 liter engine. I presently get 12.3 miles per gallon average economy. I have a fiberglass cap on this truck.! 6.5 box.



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.