Looking to actually gain some MPG

[wurgs]

 

something aint right. i dont have any hiss and no smell.

I agree. I can't hear anything from it, nice and quiet and works very well.

[kennerz]

Mine Elite can is installed right (Textbook) and I get a slight hissing and oil smell occasionally. No problems with the can at all, but have noticed a oil smell from time to time. Doesn't bother me enough to change anything or complain about it. all connections are air tight and properly secured with the right hardware.

[GDI Tech]

kennerz, are you running the E2-X dual valve? That system should never allow a smell as it provides evacuation at all operating levels.

 

And yes, driving habits have a huge impact on fuel economy.

[Mike Trnka]

If you're really dedicated to improving mpg...

 

you could either add a nose and tail to the truck...

 

or you could cover the whole vehicle with golf ball dimples

 

 

 

[kennerz]

kennerz, are you running the E2-X dual valve? That system should never allow a smell as it provides evacuation at all operating levels.

 

And yes, driving habits have a huge impact on fuel economy.

 

E2 - single.... It's intermittent only - smell oil once and a while. And it must be from the can because the truck is bone stock. And did not smell before the can install. Overall, I'm OK with it. It's not enough to bother me. Just I would like to know the cause in case I need to address something..

[joshc64311]

If you're really dedicated to improving mpg...

 

you could either add a nose and tail to the truck...

 

or you could cover the whole vehicle with golf ball dimples

 

 

 

 

the guy in the video reminded me of borat.

[GDI Tech]

 

E2 - single.... It's intermittent only - smell oil once and a while. And it must be from the can because the truck is bone stock. And did not smell before the can install. Overall, I'm OK with it. It's not enough to bother me. Just I would like to know the cause in case I need to address something..

That explains it. With the single valve, you can still have some of the PCV vapors "back flow" into the air box assy. The dual valve will not allow that as it adds the secondary suction source so always is evacuating.

 

Still a good mod to do.

 

On the golf ball dimples, myth busters did a good job of proving the added drag any smooth surface produces. Just Google a shark skin denticles to see natures most effective design to overcome drag.

[jenkins12]

My road trip i took, the computer showed 18.4mpg on the interstate at aprox 70-75mph but after calculating the larger tire/wheel combo, it came out to 19.7. The extra inch will affect your hwy mileage for sure. Negligible around town.

I have a RC 2.5" full lift (front and rear) with 33/12.5/20 tires. How do I calculate the difference in the MPH and MPG for the larger tires? I was told that the 33s wouldn't change anything but after reading through this forum, this isn't the case. Thanks in advance!!

[dbcooper748]

I have a RC 2.5" full lift (front and rear) with 33/12.5/20 tires. How do I calculate the difference in the MPH and MPG for the larger tires? I was told that the 33s wouldn't change anything but after reading through this forum, this isn't the case. Thanks in advance!!

 

U have to figure out how much larger in diameter your upgraded tire size is in percentage. Take that percentage and add it to what your trip computer is telling u

[5Horizons]

 

 

[LongrangeLauber]

 

Lol just noticed that spelling mistake 7 months later haha

 

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[Boardmember]

 

A Tonneau cover will help here's an article on actual wind tunnel test: http://www2.sema.org/main/semaorghome.aspx?id=57514

 

On average, we found that tonneau covers improve the coefficient of drag by about 5.7%. Although other tests would need to be conducted in order to determine the exact effects on fuel economy, we can use an aerodynamic “rule of thumb” which states that a 10% improvement in aerodynamic performance translates to roughly 2%–3% gas-mileage improvement. Therefore, an improvement in Cd of 5.73% would translate to roughly a 1.8% gas-mileage improvement. [/size]

 

I've had a tonneau on four 1/2 ton trucks. Nary an impact on MPG that I've seen and I'm diligent about calculating manually.

 

I'd be concerned that this test may have been paid for by the tonneau industry (SEMA itself?). Kind of like the studies showing smoking is actually good for us. Sponsored by Phillip Morris.

[HELDY_24]

Good info.

 

 

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[fbachman]

My $0.05

 

I haven't read all of these posts, so if this has been covered, please forgive me.

 

Much of this comes from personal experience.

 

-Our trucks are, primarily, tuned for emissions first, performance second. With modern engine controls and good engineering and solid design, modern engines will, simultaneously, achieve both extremely well.

 

-The issue of increasing fuel economy comes down to shifting the balance back and forth between emissions and fuel economy. Oddly enough, fuel economy and emissions move opposite of one another to some degree. An engine that meets emissions, may not have the best fuel economy that could be achieved by ignoring emissions, all other things being equal.

 

Unfortunately, if you want better fuel economy, the emissions will suffer. Thus, a tune will give you the most improvement --- at the expense of emissions. I do not say that as an environmentalist, but as someone who recognizes that, at the end of the day, the engines are tuned for emissions compliance FIRST, and economy SECOND. The 8 speed automatic trans is there for more than one reason. It's easier to control emissions if you keep the engine in an "rpm sweet spot" during the epa cycle. Many gear ratios allow you to do that more readily. In fact, I would argue that that is the ONLY reason AFM exists: the EPA cycle. It goes to an rpm sweet spot AND shuts off 4 cylinders. Emissions panacea.

 

Forget air intakes and exhaust systems and such to increase mpg. They help incrementally at best ( the improvement realized is lost in statistical noise and uncertainty of the measurement). That's how small it is.

 

If you really want a noticeable improvement in mpg, ya got to go into the timing map. This is done with a tune. At that moment, you will, most likely, no longer meet emissions compliance. Not that we care about that, necessarily---but GM has to when they comply the vehicle/power train.

 

Interestingly, tuning will get you better mpg, and probably better performance as well, even if you're targeting mpg alone. As you can only push timing so far given the fuel octane ratings available, you're probably looking at 1.5-2 mpg improvement, at best, without changing out major engine components.

 

If you want more than a tune can offer, in terms of mpg, now you're talking about cams and major engine components.

 

Now the economics. Tunes cost money. You're buying approx 1.5mpg for the cost of the tune. It will pay for itself at some point to be sure. You can do the math on that one for your particular situation.

 

My (53 year old) opinion: It is what it is. Enjoy your truck. You bought it knowing it wasn't a fuel sipper, although it is quite remarkable that a huge truck with a 5.3l engine can get 17mpg in suburban driving all day long. Just drive and enjoy. They are great vehicles.

 

Cheers !

[sdog4127]

I have said this so many times its not funny, people look to spend money on trying to get better mpg and fail to see all that money they dump into a tune etc will buy you a lot of gas in the difference in mpg. Lets say you spend 600 bucks on a intake and tune now say you picked up 2 mpg and that is stretching it at 2.00 a gallon for gas and to keep it simple you drive 10,000 miles a year it will take you almost 4 1/2 years to break even on the money you dumped trying to save mpg's, 9 years at 1 more mpg better. The same and even worse is when people buy another car that gets better mpg then the truck as the car you buy will be dead by the time you break even on money spent.[/quote

 

It's a feel good thing[emoji6]

 

 

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