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I have a 2005 titan with the big tow package stock size tires and the best mileage I can get is 11.2 combined city and highway I feel that I should be getting better than match if anyone has had a similar issue and found the problem and the solution I have put new spark plugs and new O2 sensors and recently put headers and b pipes and up rev tuned The truck runs very great but feel that it will put me in the poorhouse before too long any input would be greatly appreciated
 

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Get an aftermarket muffler that can breathe better. Cold air intake might help too. Do you have an economy map on your uprev tune? I get 15-16 in my economy map but fall to 11-13 if I run my performance tune.


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I get 13.4 in the city with my 2012, so no, don't spend money on exhaust, intake or any other crap thinking you'll get better gas mileage. If your truck in properly tuned up, tires correctly inflated and no unnecessary excess weight in your vehicle, then 11.2 is just what you're going to get.

When I fist got my 04, I got 9.X while everyone else on this forum were claiming 12.x so I went to my dealership (back in 04) and told them and they re-mapped something which did in fact change things.

If you're going to buy all the things mentioned, then do it just because you like the sound, or personalization or whatever. If you do it hoping for better gas mileage then you might be disappointed. #thetruthlol#
 

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I Also have an 05 crew cab with big tow package. I consistently get 14+ mpg or better every single time I fill up, and I live in California. Stop and go quite a bit. If MPG is what you're after, Make sure your tires are aired up to spec and that you aren't hot rodding around. Set cruise control when you can. that will be the biggest factor in my opinion. Also if I'm going highway speeds I keep my windows up with the air on to keep drag down.

I agree with Gtbigup1, If you buy all the stuff to put on in hopes for miles better mpg than you will be disappointed. They can help but wont get a notable difference IMO
 

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Go buy a can of Seafoam spray engine cleaner. Use it following the instructions, I sprayed it with the truck running at about 1500 RPM's. It'll want to die, but if you have someone running the truck just keep the truck going.

I only ran it because I was at 115k miles and wanted to clean the engine out a bit. I had no smoke while spraying, but after I let it sit for 20 minutes then went and ran the truck it smoked a ton. Went on a road trip two days later for 480 miles one way, got 16.1 MPG each way driving 75 with a couple WOT passes.

Before that I had never gotten over 15 even with a completely stock truck, and lately it had been averaging 14 highway/12 combined.
 

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I have a 2005 titan with the big tow package stock size tires and the best mileage I can get is 11.2 combined city and highway I feel that I should be getting better than match if anyone has had a similar issue and found the problem and the solution I have put new spark plugs and new O2 sensors and recently put headers and b pipes and up rev tuned The truck runs very great but feel that it will put me in the poorhouse before too long any input would be greatly appreciated
I'm on my third Titan, all had the big tow with stock tires. So we are comparing apples to apples. IMO, your getting average MPG's. 75% of my driving is in the city which I average around the same as you. Highway I can achieve 16.7/17 mpg's. I agree with other's about adding CB's, CAI's and Tuners. You wont achieve better MPG's, but you will be guaranteed to wake up the already potent beast with additional HP & TQ. My truck runs like an ******* having an aftermarket exhaust, cold air intake and being UPRev tuned. I will also mention the fun factor increased, without my MPG's decreasing. :big_grin:
 
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Mine is stuck at 10.8. I reset it and on long trips I can get up to close to 14i, but with my normal driving it almost always settles right back at 10.8. I have big tow as well.
 

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I have a 2004 SE crew cab with tow package that has 127k on it. I recently put in headers, Cajun b-pipes, uprev, air box mod, and grounding kit. I've been getting 18-21 mpg cruising around country roads on regular pump gas. Before with the cracked manifolds I was lucky to get 12mpg. Not sure exactly why I'm doing so good but it is possible.
 

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I seem to average about 17mpg on the highway. I have a 2015 with the big tow gearing. I think it's just the price we pay for a fairly large truck with a V8.
 

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I think anything over 14mpg you should consider yourself lucky! lol
 

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I typically get between 17.5 and 18.0 hand calculated. My driving is 90% highway at speeds between 60-70mph. Last 5 tanks or so though I've been barely scraping together 17 mpgs. Not sure what's up with that... but still 17mpg for this truck is pretty good.
 
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