Mpg on 5.3 cammed, longtubes, tune

[skaffy03]

Does 14mpg (highway) and 11-12mpg(city) seem right for a 2004 tahoe z71 with a 212/218 cam, longtubes, and a black bear tune? I need retuned for headers but still... I also have 285/70/17 BFG ATs

New O2 sensors btw. Can't find vacuum leaks anywhere, either. Can't find any exhaust leaks.


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[Big Buttons]

Thats a little low imo. I get 13-14 city 19-20 highway. 219/227 high lift cam. And I drive it like I stole it.

 

[skaffy03]

Any ideas to get it going right again? Tranny has never been replaced, old fluid. Not slipping. Diff fluid never changed either.

I can't find any vacuum leak but I'm starting to wonder if I should just go ahead and replace my intake gaskets? Maybe low fuel pressure?


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[afpj]

Clean maf and tb. You sure the new O2 sensors working?

 

[skaffy03]

Maf is clean. Tb is clean. I got the shit Bosch o2 sensors but it's getting the same mileage now with the new sensors as it was with the old sensors.

Maybe dirty injectors? 167,000 miles on them


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[afpj]

If you got a bbtune assume you did the other tune stuff like plugs etc. May be to.e to run a few sequential bottles of techron cleaner. Hopefully a tune for the headers makes some improvement. Good luck.

 

[ccapehartusarmyINF.(ret)]

okay actually yer pretty lucky as fuel economy goes avg for an 02 tahoe is 14 mpg and thats stock and the dealer sticker says 13 city 18 freeway according to fueleconomy.gov
the average owner gets 14 mpg 13 city and 17 freeway and thats stock
and cmon dude 2002 suburban 19/20 highway mpg in yer dreams the mileage on the dealer sticker is 13 city 18 highway wich we all know is slighty exagerated
even the new ecotech granola friendly gaurunteed to save owls 5.3 liter v8 in the 2015 is claiming 16 mpg city and 23 highway
so sorry a 5.3 drastically modded with a cam getting 19 to 20 mpg im gonna call BS and i dont care if jesus christ himself did the tune.
technically drastic mods shouldnt hurt your fuel eco that much the biggest problem with fuel eco after you mod your motor is the driver

 

[Big Buttons]

I'm sorry you feel like I am lieing but that is what I have gotten. I got those results twice when I really wanted to see what it could do. I don't normally drive like that though. When I drive like I usually do it's more like 12city 16-17highway

 

[mattluttrell]

I have an 02 Escalade with the 5.3 and about the same miles. I can get close to 20 (avg 19) mpg on highway.

Yours does seem a bit low.

 

[mikeyss]

What gears do you have? My '05 hoe has 4.10's and I barely get 13 city and 17 highway.

 

[ccapehartusarmyINF.(ret)]

hey big buttons sorry if you felt like i was callin you a lier that wasnt my intention
it was meant to be more of a friendly "BS" but hey if thats the kinda mileage you get i need to figure out what your doing that im not
here in arizona we also have an enviromental variable to factor in
its between 100 to 110 on a daily basis so AC must be ran at all times almost on full blast wich im sure doesnt help my fuel economy
also an experiment thats been done in the past is one of the biggest causes of added fuel consumption is when you drive down the highway with your windows down when ever you get above 65 roll your windows all the way up

 

[skaffy03]

I have 3.73s

Posting up on pt.net as well to get more input


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[Chiggy]

It's the tires. I went to the 285/70 BFG AT's and it killed my mileage. They are very heavy. I've got a K&N cold air, Doug's long tubes with ORY, tune, etc etc. It's the tires for sure. I used to get 18ish average mixed driving. Now I get 14-15ish. I've got an 05 Z-71

 

[skaffy03]

Well shit. I switched from my mud terrains to the less aggressive BFGs and it all got worse. Oh well. Guess I'll have live and learn haha


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[01Konvict]

I get 13-14 city and 17 highway but sometimes I drop to 11-12 city just depends on how many stop lights and speeds below 40 mph. I have a blackbear tune, K&N cold air intake, magnaflow catback, electric fans, 33s with 3.73 gears.

 

[skaffy03]

If I ever hit 17mpg on the highway I have to pull over, have a piñata delivered, and have a little celebration for myself. Then I have to get in, and take off from the side of the road and realize how much gas it took to get going 70mph again..... Lol


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