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Chevy Silverado and GMC Sierra Real World MPG Numbers

116 messages,  Last post on Aug 23, 2009 at 6:14 PM

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What is this discussion about? Chevrolet Silverado 1500, Chevrolet Silverado 2500, Chevrolet Silverado 3500, GMC Sierra 1500, GMC Sierra 2500, GMC Sierra 3500, Fuel Efficiency (MPG), Truck

#47 of 116 Re: Better Mileage! [brix92] by coontie57 Feb 03, 2007 (2:57 pm)
Replying to: brix92 (Feb 03, 2007 12:24 pm) my buddy has the 6L on his 3/4 ton... he gets less than you do.. with my diesel I get 20.2 mpg and its not broken in yet.. 8K miles. Replies to this message: eaubes (Feb 28, 2007 2:22 pm) eck_95z71 (Jun 08, 2009 12:20 am)
#48 of 116 Re: Better Mileage! [coontie57] by eaubes Feb 28, 2007 (2:22 pm)
Replying to: coontie57 (Feb 03, 2007 2:57 pm) I just purchased a 2007 2500 HD Classic, 6.0,4:10 rear.I just turned 1000 miles on the Odometer. I am only getting 10 MPG. I Traded in an 01 2500, and I was getting 13-14 with that tuck. My freind told me that installing a Tornado raised MPG by 2 Gal. Has any one had experiance with this, or a programmer. Replies to this message: eck_95z71 (Jun 08, 2009 12:20 am)
#49 of 116 Poor V-6 MPG by xbbuster Mar 26, 2007 (5:04 am)
I have an '07 Classic Ext Cab W/T with the V-6 and the 3.23 rear end. It has only 800 miles on it but checking the mileage I am only getting 12 mpg city and 16 on the highway using cruise going 65 with the AC off. I had a '95 W/T V-6 that got nearly 18 MPG on the road, it had 100,000 miles. Will this get anywhere near what Chevrolet claims....16 and 21 MPG?
#50 of 116 2006 crew cab sb vortec max 4x4 6.0 same engine as SS by motohead77 Mar 26, 2007 (10:50 am)
Replying to: eng_buddyh (Jan 04, 2007 12:05 pm) I check my mileage every tank and I calculate actual mileage with gallons used at the same pump. I consistently get 12.5 around town no highway and the best I have gotten on the freeway is 17.4mpg from Anaheim ca to San Diego freeway driving on flat highway cruising at 75. Also on the way out to glamis I reg get, with a dirt bike and associated gear average 16-17 but there are only a couple of grades and its mainly flat. I am waiting untill chevy offers their new 6.2 liter 400+hp cadillac engine in the new vortec max with 6speed trans in their h.o trucks within the next 2 years. My add ons are a flowmaster cat back (actually made for 8.1 liter) and Air aid intake and full castrol synthetic with Lucas synthetic additive. 0 mileage difference with all of my add ons but the truck is quicker =) I am not nice to my truck and I consistently stomp on the gas around town because getting to work is much more fun that way. I am going to try a tune that is supposed to get my truck 30 more horse and 2-4 mpg better from, Wait for me performance they reburn or send you a new pcm. I will repost when I get it installed and see if it actually helps. I think those tornados are junk, for the millions of dollars manufacturers spend to get 1 mpg better in their vehicle's, if the tornadoes actually worked every manufacturer would have them on all their vehicle's from the factory just my opinion. Colby motohead77hotmail.com Replies to this message: eaubes (Mar 26, 2007 3:14 pm)
#51 of 116 Re: 2006 crew cab sb vortec max 4x4 6.0 same engine as SS [motohead77] by eaubes Mar 26, 2007 (3:14 pm)
Replying to: motohead77 (Mar 26, 2007 10:50 am) Thanks for the input. I am interested to see how the tune works.
#52 of 116 mpg w/AFM by 1offroader Mar 26, 2007 (6:39 pm)
I bought a 2007 Chevy 4x4 Crew Cab w/6.0L Vortec Max engine & 3.73 gears a couple months ago. A couple weeks ago I drove from Modesto, CA to Los Angeles, 335 miles, via Hwy. 99 and I-5. If you are familar with the route, it is mostly flat along the Hwy. 99 part, then once it merges with I-5 it's some steep climbing over the Grapevine and the local mountains. 70 mph, cruise control mostly on, a/c on the entire way.   Got 18.2 mpg overall. Extremely pleased and surprised with the mileage. That is excellent mileage for a full size pickup with gobs of power. The "old" EPA rating of 19 mpg highway looks very achievable (or even exceedable) based on my experience, once the vehicle is broken in, and if speeds are reduced to 65 mph.   Active Fuel Management really works. You can see it toggling back and forth from V-8 to V-4 mode. BUT, you cannot feel it unless your foot is on the accelerator when it happens. And then, just barely. It's a great invention if it stays reliable.   Not the forum for discussing Toyota, but I don't hear of anyone bragging about that kind of mpg in the 5.7L Tundra. And yeah, I'm bragging.   1offroader
#54 of 116 Re: Light Truck Power Package [coontie57] by coontie57 Mar 27, 2007 (6:34 pm)
Replying to: coontie57 (Sep 28, 2006 6:48 am) I now have 10,000 miles and just got back from Florida and I was pulling my 12000 lb camper... When I was in FL and driving 55mph I got 11 mpg... then on the interstate at 65-70mph it dropped to 10.4ish..   I must have had it FULL because it was slower coming up Saluda Mtn... just 56 mph today... and screaming..   Diesel in FL was $2.69+..... in Spartanburg $2.53 and in Fairview, NC $2.80... PHOOOEY I saw it on I 95 at $2.51 in SC..
#55 of 116 2007 2500HD Crew Cab Duramax by farmertim Apr 02, 2007 (1:46 pm)
Bought my truck on friday, dealer filled it up, and i filled for the first time today. I logged 378 miles, put in 22.5 gallons for 16.8 mpg. This isnt too bad, but it was about 90% highway miles at 60-65 on flat iowa roads with little wind and no load in the box and nothing being towed. Hope this goes up when the engine gets broke in as my 2001 Dodge Cummins would regularly get 20-21 on tankfulls like that.
#56 of 116 '07 3500 Duramax/Allison 4x4 by jklingel8 Apr 19, 2007 (9:00 am)
Just picked up an '07 3500 4x4, turbo Duramax w/ Allison 6-spd, SRW. From Anchorage to Frb, 350 miles, rolling hills and some descent hills around Nenana, we got 20.5 mpg. Traveled mostly 60-65 mph. I was amazed that the rpm, 1600 at 65 mph, never changed on the uphills. My '93 F350 w/ a non-turbo 7.3 liter would have r'd way up and the after-burner kicked in many, many times. So far, so good.

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