During active regeneration (commonly required on trucks that idle a lot or aren’t worked hard), the ECM calls for fuel to be injected on the engine’s exhaust stroke. } Ah, somebody better tell Chevy that mileage is supposed to get better each subsequent year, not worse. Don’t forget to tune in for Part 5, where we spotlight the LML—the Duramax that brought more robust internals, a higher pressure injection system and additional emissions equipment to the table. In April of 2007, engine number 1,000,000 was put on display at DMAX Ltd. headquarters upon final assembly. function changelink() { ) During regeneration, you’ll also notice EGT climb above 1,000 degrees, a difference in the engine’s idle and that injection timing has been retarded. Speed is more critical on a diesel than a gas engine. Your GM dealer has access to the warranty repair history of this truck using the GM Vehicle Inquiry System. The name of the game in meeting particulate matter emission standards is to maintain sufficient heat in the engine. Tips on performance, fuel economy, troubleshooting and more. However, once the injector issue is addressed, th… Leading a hard life of towing or other demanding use shortens the lifespan of any engine, but will impact a gasoline engine more than it will a diesel. It has 83,000 mile on it. A malfunctioning transmission OD and TC lock-up system could reduce your fuel mileage by 1-5 miles per gallon. The "GM Product Service Training Manual for the 6.2L Diesel Engine" (#16015.05-1D) has this to say about GM diesel fuel mileage: "The diesel, like any engine, is affected by driving habits. It uses a direct injected fuel system which was the first of its kind in a pickup truck. Duramax Horsepower & Torque by Model Year and Engine Variation. Horsepower Settings Switch: *Stock *30 HP - Heavy Tow *60 HP - Mileage and Medium Tow *90 HP - Mileage and Light Tow (Max 150 ft/lbs Torque) ORDER ONLINE 24/7 1-800-450-5333 Click to Call or Text 2011-2016 GM Duramax 6.6L LML PRO Performance Module BENEFITS OF UPGRADING:. What do I need to know about this, if it is an issue? Trucks equipped with either the Duramax 6600 or 6.5L turbodiesels can tow twice that weight at 65-70 mph while producing fuel economy in the 10-13 mpg range. The newest 2011 Duramax was promoted as being approximately 10% more fuel efficient than the 2010 model it replaced. Fuel Savings: Up to 10-20% improvement over stock ='s 100 more miles tank fuel… for (var i = 0; i < this.length; i++) { It was during the LMM’s tenure that GM produced is 1 millionth Duramax. Assuming the pump price of gas and diesel were the same, a diesel could save you $1500 or more in fuel costs per 100,000 miles of light duty driving and/or up to $2500 or more when doing a lot of towing or other high power demand driving, when compared to a gasoline powered truck with identical gearing. The version aboard the LMM has slightly different internals due to its need to control the new emissions system, and it also communicates with the rest of the modules on the truck through an updated CAN bus system. Fuel Economy of the 3 Most Common 6.6-Liter Duramax Diesel Trucks. In addition to the engine and fuel injection system, the new warranty covers all aspects of the powertrain, including the transmission, transfer case and rear differential. it doesn't look like it because it filled the wheelwells out (front and rear) real good. this.length = initArray.arguments.length; function rotatebannersrandom() { "", Some have offered the opinion that the 2007 EPA mandated Ultra Low Sulfur Diesel (ULSD) fuel was a factor in producing a price differential that favored gasoline, but there are likely many factors, among them supply/demand - which is affected by U.S. diesel fuel exports (yes, the U.S. exports a lot of diesel fuel). In the July 2000 issue of Four Wheeler magazine, they tested a 2000 GMC Yukon XL 2500, equipped with the new 6.0L gas V-8. "https://www.thedieselpage.com/newbooks2018.htm", We've learned that fuel economy for vehicles equipped with a 6.2 or 6.5 diesel engine can vary quite a bit depending on vehicle health, transmission options, gearing and driving habits. Keep in mind that the diesel engine option will add value to your trade-in. while (currentnum == randnum) (Photo courtesy Chevy) In a surprising move, the 2021 Chevy Silverado 1500 Duramax diesel will see a big drop in the stated MPG ratings versus the prior year, and nothing significantly changed from the 2020 model. So effective are the EZTuner mileage tunes at giving you both optimal fuel mileage and power gains, that it makes other performance products nearly obsolete with its 30 Day Satisfaction Guarantee. If you're buying a new diesel truck and want the best possible fuel mileage, get a truck with the highest gear ratio available and an overdrive transmission. Odds are that the owner is selling the truck at least partly because of the looming warranty expiration. As is the case with most modern diesel engines, emissions-control devices account for the majority of premature failures. OD automatics not shifting into OD, or the lockup torque convertor not locking up. Although they retained the same basic body architecture as the units found in the LBZ and still saw 26,000 psi worth of fuel pressure, the Bosch solenoid style common-rail injectors in the LMM were equipped with revised nozzles. Search by make for fuel efficient new and used cars and trucks. This meant more exhaust gas recirculation (EGR) would be necessary on the LMM, which called for a larger EGR cooler for increased cooling capacity and operational lifespan. Wind drag factors needs to be considered as well. "https://www.thedieselpage.com/images/TDP02-02.jpg", When compared to a gasoline 8.1L, the diesel will save you even more.). Recognizing that every individual's motoring journey is unique, we seek to give form to both untold as well as celebrated facets of the automotive world. According to GM, factors (not in any particular order) affecting fuel economy are: Send e-mail to: turbo@TheDieselPage.com The 4.10 ratio seems to be the most prevalent gear ratio found on 2500 series trucks and Suburbans. Join the thousands of diesel truck owners why discovered the best way to increase your Powerstroke, Duramax, and Cummins diesel truck's fuel mileage is to upgrade with a MPG Performance Module. var bannerlink = "https://www.thedieselpage.com/books.htm" To keep tabs on the truck’s regeneration status, many owners turn to the Insight CTS2 from Edge Products (the original CTS monitor is pictured above). 9 comments. "", Also incl… { The square style EGR cooler used on the LMM is fairly robust compared to what you’ll find on other diesel engines, but they are known to plug up, crack and leak from time to time. "https://www.thedieselpage.com/images/Injectors-460x60.jpg" But there is more than one way to increase the fuel economy on a Duramax diesel and save money on gas. Anyone... who fears a high-dollar fuel injection service (or any other high-dollar automotive repair), and is contemplating owning or buying a used diesel pickup that is nearing the end of its factory warranty, should buy an extended warranty that covers the drivetrain, which includes the engine and fuel injection system, transmission and differentials. www.TheDieselPage.com. "", In 2011, federal emissions regulations had tightened, so additional measures had to be taken to keep the Duramax compliant, so the LML was the first to be equipped with Selective Catalyst Reduction (or SCR), a system which used a urea-based exhaust fluid to break down harmful nitrogen oxides. Beginning with the 2008 model year, GM returned to a 5-year or 100,000 mile powertrain warranty. it had 285 on it. A truck with 4.10 gearing is running at about 2250 rpm at the same speed, which typically produces about 15 mpg. Over 8,285 miles, this small SUV produced an average of 16.52 mpg. This means the engine needs to be under some sort of load at all times, and the intake airflow valve (i.e. These modified transmissions use fluid pressure, shaft speed and throttle position from the "kick-down" T.V. ) 23. Close. I've been driving diesel light-trucks and SUV's since 1986. To cope with the added heat (i.e. You can read more about fuel economy being delivered by the newest Duramax engines in our bulletin board. The 6.6-liter Duramax is produced by DMAX, a joint venture between GM and Isuzu in Moraine, Ohio.The Duramax block and heads are poured at The Defiance GM Powertrain foundry in Defiance County, Ohio.This engine was initially installed in 2001 Chevrolet and GMC trucks, and has … "", Like the LBZ that came before it, the LMM uses a Bosch EDC16-based ECM, but it’s not the same unit that controlled its predecessor. Several suppliers can be found in any one of a half dozen different Off-Road or 4X4 magazines. Copyright © 1996-2018 by The Diesel Page We invite you to get behind the wheel with us, it's certain to be an interesting drive. Search by Manufacturer. The LMM is no different, with its labyrinthine-like exhaust after treatment also contributing to poor fuel economy, diluted engine oil and reduced long-term engine longevity. During instances of towing, hauling or spirited driving its services aren’t required. Over the engine’s lifespan it has gone through 6 different engine variations: LB7, … James Beagle. The same reliable Bosch CP3 high-pressure fuel pump was used for pressure creation—and it was still void of a lift pump supplying it fuel from the tank. Those voting in this poll were asked to round their fuel economy results to the nearest whole number. document.BannerAd.src=images[randnum] 3 Horsepower Settings Switch: *Stock *30 HP - Heavy Tow *60 HP - Mileage and Medium Tow *90 HP - Mileage and Light Tow (Max 150 ft/lbs Torque) ORDER ONLINE 24/7 1-800-450-5333 Click to Call or Text. Driving Line® Accelerating Automotive Passion™ by providing a fresh angle of what fuels us. The color touchscreen monitor allows you to see when the truck is in regeneration mode, as well as watch the soot accumulation reading from the DPF (measured in grams on the bottom right). When calculating overall fuel cost comparisons, you should take into account the difference in price between gasoline and diesel fuel as well as fuel economy differences. "https://www.thedieselpage.com/images/ConversionMountsbanner01.jpg", For towing trailers that weigh 4,000 pounds or less, a 3.42 differential ratio is probably the best choice in a 6.5TD equipped truck. Our 2001 GMC 2500HD Duramax/Allison equipped 4x4 crew cab delivers 17-18 mpg during local driving and 20 mpg on the Interstate at 75-mph. This will ensure a sufficient flow of ATF cycling through the transmission to help prevent it from overheating. Search by make for fuel efficient new and used cars and trucks. location = bannerlink Gain up to 5 MPG more miles per gallon with your diesel pickup. Fuel economy may vary as much as 5 mpg in a given vehicle with different drivers.". The above images are self explanatory, but demonstrate the fuel economy currently being experienced by hundreds of Duramax 6600 owners. This condition is perhaps the most significant factor in obtaining good fuel economy. The one Achilles heel of the LB7 Duramax engine is injector failure. Fuel economy is also very impressive, with up to 22 mpg in the city and 30 on the highway for 2 wheel-drive models. You should be able to feel the transmission shift into overdrive and torque converter lockup. To quote Four Wheeler, "During unladen city/highway blasts, we averaged nearly 12.5 miles per gallon with a best tankful of 13.05 - quite good compared to the last big-block we tested, which averaged 10.8 mpg." The trailer towed for this test was a 21' Coachmen Futura that weighed 4,331 lbs. The only time you have any real leverage with the dealership or a private seller is before you sign the papers, so make this a condition of sale. Members. } Located beneath the glovebox, these VSSBs are specific to the gearing and tire diameter, and need to be changed (or re-programmed) to one that matches the new gearing or tire height if you make any changes to the effective final gearing. 2017-2020 GM Duramax 6.6L L5P PRO Performance Module BENEFITS OF UPGRADING:. Replacement VSSB modules are re-programmable by the truck owner to compensate for any gearing changes. That year, Ford, Dodge and GM all released engines designed to meet the new particulate matter (PM) and nitrogen oxide (NOx) limits mandated by the Environmental Protection Agency. We produced articles in 1999 and 2000 dealing with the "Vehicle Speed Sensor Buffer". Since at least 1986, when I began driving a diesel pickup, the pump price of diesel fuel had been less than self-serve gasoline most of the time - by as much as $0.20/gallon. The Duramax seems to like 60-70mph as a compromise between RPM and aero drag on the highway. Im doing 75-80 and avg is around 16-17 2020 Duramax AT4 Edited October 27, 2020 by Arkangel The 3.08 ratio is available only for the C1500 series versions (2WD) and the K2500 series Suburbans are only available with the 3.73 or 4.10 axle ratios. alttext = new initArray( document.BannerAd.alt=alttext[randnum]