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Old 05-19-2008, 09:58 AM
 
Location: Newport, NC
955 posts, read 4,087,917 times
Reputation: 724

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I have a 2005 Silverado 4WD with the 5.3 liter hi output Vortec engine. Engine puts out 310 hp and gets 17 miles city, 20 miles highway, I drive conservatively. My question is: Can I improve my gas mileage by having dual exhaust installed? Are there other fuel saving improvements I can make? Before anyone suggests a smaller truck, I live in Erie and I'm in charge of snow removal at a local institution. I'm out before the plows and have to drive in some really bad weather, I need the full size truck.
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Old 05-19-2008, 10:21 AM
 
Location: Southern Arizona
9,599 posts, read 31,685,641 times
Reputation: 11741
Not a Chevy Mechanic here, Rtom45 . . .

However, I realized a significant improvement in both PERFORMANCE and GAS MILEAGE after having a full dual exhaust system with "performance" mufflers installed in my 4X4 Silverado with a 350 V8.

Good Luck
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Old 05-19-2008, 10:51 AM
 
Location: Tulsa, OK
5,987 posts, read 11,670,577 times
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Headers would also help the engine breath better. There are also a variety of air filters, intake & injector improvements. Contact one of the large mail order performance parts houses. They can be very helpful.
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Old 05-19-2008, 05:56 PM
 
Location: California
11,466 posts, read 19,345,447 times
Reputation: 12713
Quote:
Originally Posted by Rtom45 View Post
I have a 2005 Silverado 4WD with the 5.3 liter hi output Vortec engine. Engine puts out 310 hp and gets 17 miles city, 20 miles highway, I drive conservatively. My question is: Can I improve my gas mileage by having dual exhaust installed? Are there other fuel saving improvements I can make? Before anyone suggests a smaller truck, I live in Erie and I'm in charge of snow removal at a local institution. I'm out before the plows and have to drive in some really bad weather, I need the full size truck.
If your getting 17 and 20 I wouldn't touch it, your not going to do much better than that, in fact you can hurt the milage by messing with it. I added a 3 inch exhaust and cold intake system to a pickup and I lost a bunch of low end power, I gained in mid range but it didn't change the gas milage at all.
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Old 05-19-2008, 06:19 PM
 
Location: Eastern Washington
17,208 posts, read 57,041,396 times
Reputation: 18559
I'd try the following:

1 set of NGK sparkplugs in the correct heat range. You could consider opening the spark plug gap a little more than factory spec, but don't get carried away. It may or may not be possible/practical to "index" your sparkplugs, so that the ground electrode "points" towards the intake valve. This does help with the old cast-iron SB Chevy V-8. What's important is that the ground electrode not point *straight* at the exhaust valve, so that it interferes with fresh mixture getting into the spark gap itself.

2 use the thinnest grade of synthetic oils compatible with your owner's manual recommendations in engine, tranny, and rear end. I particularly like Red Line Oil, it's expensive but damn it's good.

3 If your fuel filter is due for a change, change it, I have seen many modern cars that were running "fine" pick up a little MPG with a fuel filter - but these cars were overdue. In fact any deferred maintenance should give some improvement if you do it. How old is your oxygen sensor?

4 consider adding maybe 2-3 more PSI in your tires than the factory recommendation.

5 Techron or similar injector cleaner may help a little if they are dirty

6 a flush-fitting cap on your open bed may help a little, particularly at highway speed.

7 This being a Chevy it's almost certainly an automatic. But if not, try opening the throttle *a little* more and shifting up *a little* sooner as you accelerate from a stop. BMW did some research in the '80's that showed this can improve economy at the same level of performance. Don't get carried away and lug the engine.

As said, 17-20 is pretty good for this kind of rig so you won't do much better. All of the above will help a little, but if you did all of it and got 2 more MPG I'd be surprised.
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Old 05-22-2008, 10:47 AM
 
Location: Newport, NC
955 posts, read 4,087,917 times
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Is there any fuel savings gained by putting taller tires on the truck?
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Old 05-22-2008, 12:22 PM
 
Location: Eastern Washington
17,208 posts, read 57,041,396 times
Reputation: 18559
If you don't usually carry a load, probably. Particularly if you drive on the highway a lot.

I think this truck can be "programmed" with tire rolling diameter so your speedo/odometer stay accurate.

If not, realize your mileage per the odometer may get worse, since the truck will travel further than the odometer indicates, yet your fuel burned measurement will remain accurate.

I think the stuff I posted before will be more cost-effective for you than the tires, particularly the fuel filter if it needs changing. If it's more than say 30K miles old I would start there.
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Old 06-12-2010, 03:36 AM
 
1 posts, read 16,866 times
Reputation: 10
I have a 1987 C10 Pick up, The AC went out and I was told that I would have to take it to a dealership to get it fixed is that true
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Old 06-12-2010, 06:45 AM
 
Location: North Carolina
1,341 posts, read 3,912,210 times
Reputation: 1306
I installed a set of Pacesetter shorty headers and flowmasters on my '98 K1500. I couldn't tell a big mileage change but it did seem to pep-up my low end torque a small bit.
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Old 06-12-2010, 07:18 AM
 
48,502 posts, read 96,816,250 times
Reputation: 18304
I had flow master and never saw any noticeable milage. Difference when check the same long trip I use to drive many times.
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