From GM... .
2010 GM Full-Size Pickups Achieve Best-in-Class Fuel Economy
General Motors announced today that powertrain enhancements have enabled Chevy Silverado and GMC Sierra pickups to achieve best-in-class fuel economy, based on the latest EPA estimates.
Silverado and Sierra 5.3L V-8 engine EPA-estimated fuel economy improves for 2010 from 14 city / 20 highway to 15 city / 21 highway MPG, while Extra Fuel Economy (XFE) models move from 15 city / 21 highway to 15 city / 22 highway MPG. This development, combined with the fact that GM's hybrid pickups achieve an EPA estimated 21 city / 22 highway, puts Silverado and Sierra at the top in fuel economy.
Contributing to this development is a new fuel saver mode which enables the trucks to make better use of GM's Active Fuel Management system, running on four-cylinders in light throttle conditions instead of eight. In addition, more efficient six-speed transmission shift points, engine variable valve timing and a lower gear ratio of 3.08 (now standard on GM full-size pickups) each play an important role in the improved fuel economy.
This fuel economy improvement comes with no compromise in capability. Horsepower, payload, and trailering specifications remain the same for Chevy and GMC full-size pickups.
For reference, the following information is the most recent available EPA-estimated comparable fuel economy data for GM's main competitors in this segment.
Ford - 5.4L: 14 city / 20 hwy; 4.6L with 6-speed transmission: 15 city / 21 hwy
Dodge - 5.7L: 14 city / 20 hwy
Toyota - 5.7L: 14 city / 18 hwy; 4.6L: 15 city / 20 hwy
Nissan - 5.6L: 13 city / 17 hwy; 5.6L (E85): 13 city / 18 hwy
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-----The orginal Mr.Goodwrench on the JBO since 11/99-----
When my 96 K1500 was new it managed 22 MPG highway and it is just the 4.3L (way to small for that truck). Right now its about 19 MPG and its a very tired engine. If I am really careful I can pull off about 17 MPG city right now.
Hey don't mean to draw away from the subject, but Mr. Goodwrench G.T. Since i drive and worki on these trucks 6 days a week, i'd been wodering something for quites some time. How much of a difference in vehicle performance and fuel conservation would this AFM mode would affect if it came on while the truck was idleing like at a stop light or drive thru? I know it won't affect MPG hugely but I think it would benefit total milage per tank. I'm sure it would affect vehicle idle and A/C performance. I would just like to know what you think about it.
You are surely on the right track.
But A/C would not be affected at all. Idle soud might be quieter when measured in decibels, vibrations might be more apparent as it is not as balanced as a V8. AFM will just give you a longer range per tankful as it is now not running on 8cyls when not needed, ie like the scenarios you mentioned.
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-----The orginal Mr.Goodwrench on the JBO since 11/99-----
DOD surely ruins the exhaust note of any V8.
I am curiuous to see how much these complex trannies are going to cost to rebuild. Hopefully more than the fuel they have saved.
With my truck, HWY mileage is not the issue. It's actually pretty good without DOD. It's the city driving that kills economy. Where DOD has no place or relevance. No matter what, you are still accelerating alot of mass.
ANyway, I'm glad they ahve somethign new to brag about. I consider the GM truck the best "working" vehicle out there.
i like the new six speeds, granted the first one 6L70 came out had some issues with the internal mode selector(nueltral safety switch) haven't seen any 6 speeds come in for repair heavy duty or light duty. Seen more than a few 4 speeds but that is typical down here, haven't had a year where we didn't do a couple. When they first started came out in 1500 series people would come in and complain that its shifting funney or it feels like it has no power, or course nothing wrong with them just the torque managment software, but the six speed is definatly different feeling with anything with below 380 TQ.
oh and about the exhaust not man drives me nuts when people put aftermarket exhaust and complain about it. Even when they by a 4 x 4 lift it bigger tires then they complain that it doesn't work anymore it never says V4 mode after mods. When we try to explain to them that the lifts and bigger tires effect that greatly they just give us the "We are never come back to this dealership again, you guys just want to work on our vehicles" sure enough a week later most of them come back saying how sorry they were.
Well, it's not like GM murdered the competition. They are like 1mpg average above the nearest competitor. The way most people drive they are all going to get about the same milage anyways.
This is good press for GM, but IMHO it's a meaningless win.
frank hernandez wrote:i
oh and about the exhaust not man drives me nuts when people put aftermarket exhaust and complain about it. Even when they by a 4 x 4 lift it bigger tires then they complain that it doesn't work anymore it never says V4 mode after mods. When we try to explain to them that the lifts and bigger tires effect that greatly they just give us the "We are never come back to this dealership again, you guys just want to work on our vehicles" sure enough a week later most of them come back saying how sorry they were.
The real measure of a service advisor is thier ability to avoid customer confusion. A service advisor needs to be able to help the uninformed before they get frustrated with thier ignorance.
