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#1
09-03-2004, 02:27 PM
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Gas mileage not as good as identical trucks
I've talked to 6 other owners of 02 Z-71s with the same everything. Engines, gears, factory tires, etc. They all get the same range of gas mileage, 16 to 18 mpg. I don't dog my truck and I get 15-15 and a half. I have a K&N factory type air filter and a Hypertech as the only modification. I removed the MAS and srayed it with contact cleaner in case it was oiled from the filter, but it didn't help. the Hypertech didn't really affect the mpg. I have syn. motor oil and 30psi in the front tires and 28 psi in the rear. There are no codes on the computer. Could a spark plug be weak or set wrong? Maybe a weak coil? Any suggestions would be appreciated. Thanks, Cliff
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#2
09-03-2004, 08:17 PM
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Re: Gas mileage not as good as identical trucks
Remove your modifications and see if your mileage improves.
Also check the tire badge on the inside of the drivers door...I think your tire pressure is a little low.
__________________
Why do you never have enough time or money to do the job right the first time, but enough time and money to do it again? Got all the certifications 25 years ASE Certified Master Technician GM WCT Yea..I work at a DEALERSHIP....got a problem with that? Want to diagnose cars like the Pros? FOR SALE: OTC Perception 2 channel Labscope (badged as a Matco Reality) This is my personal labscope that I use to diagnose waveforms, like new, comes with leads and training video PM Me for details
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#3
09-05-2004, 11:35 PM
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Re: Gas mileage not as good as identical trucks
Thanks, I'll try that and let you know.
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#4
09-06-2004, 08:18 AM
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Re: Gas mileage not as good as identical trucks
I got 14-15 MPG even with the K&N FIPK and Superchips programmer. I went to Mobile One oil but the big difference came when I got rid of the factory muffler and replaced it with a Borla Turbo one. I now get 18-19 MPG. The muffler is a little loud in the cabin and kinda drones but it's not that much louder then stock outside.
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#5
09-06-2004, 09:46 AM
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Re: Gas mileage not as good as identical trucks
I lost mpg on my 99 5.3 when I replaced the factory muffler with a flowmaster dual out setup. Low tire pressure will also add rolling resistance and reduce mpg. I also noticed that as my truck got older my mpg continued to drop. When it was new I got around 16mpg in town and a little over 19 on the highway. When I got rid of the truck it had 30k on it and I averaged just under 15 around town.
__________________
06 Toyota Tundra Double Cab
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#6
09-06-2004, 11:00 AM
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well my mileage has dropped since i bought mine, 7 weeks ago. the only thing i have done is add flowmaster 40 dual and got 285 tires. i am getting 14-16 avg. so i am not sure what to do with mine, i could get 20mpg on the hwy easy, not now tho.
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#7
09-06-2004, 02:46 PM
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Re: Gas mileage not as good as identical trucks
Quote:
There needs to be some backpressure in the exhaust so the O2 sensors will read properly and the cylinders will scavage properly. Why do you think drag racers have been installing mufflers and exhaust pipes instead of leaving the headers open?
__________________
Why do you never have enough time or money to do the job right the first time, but enough time and money to do it again? Got all the certifications 25 years ASE Certified Master Technician GM WCT Yea..I work at a DEALERSHIP....got a problem with that? Want to diagnose cars like the Pros? FOR SALE: OTC Perception 2 channel Labscope (badged as a Matco Reality) This is my personal labscope that I use to diagnose waveforms, like new, comes with leads and training video PM Me for details
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