So I'm new to tundra i I got a 2015 crewmax 4x4 5.7 ffv

Hello the truck im purchasing has 37x12.50r20 and I get like 8.5 mpg. Can I use a certain tuner to calibrate the speedometer and also to get better mpg without losing my warranty? Please help me out ty

 

Hypertech and rough country make a speedo calibrator for our trucks. But they both recommend setting it back to factory before bringing it into the dealership..

 

also we need to see pictures of said tundra on 37s

 

my sticker says unleaded gas but I goohled the vin. And it says ffv. Also says sand biege interior and its all black leather lol next ill post me and the truck I asome its a 6in. Lift I'm not sure.

 

Could have katskins leather installed. If you look at my sticker it would say grey interior. But for around 1k I now have red leather

 

thank you for any help from everyone that can help me i never had a li f ter truck or big tires. First time I'm a Virginia lol but I love this truck for the beach I will get out safe God willing and home safe.

 

Sweet rig man. Your gonna love it. And ya that looks to be a 6 inch lift its pretty big

 

Sir I took this picture on the bottom this bars are not connected to anything is it dangerous or is their a reason?

 

It drives smooth and very stable. Just at 65 mph I was going 75 mph says the speed reader on the freeway.lol

 

Those are your anti sway bars. They keep the truck from having excess body roll while cornering. Better on road handling. People who are serious offroaders remove them tho..
Here's mine

 

Yea that will happen. Mine is worse than that I have 38s. They haven't released the calibrator for my truck because its to new but yours is out.
Here is the link

Hypertech 730119 Speedometer Calibrator

https://www.amazon.com/Hypertech-730119-Speedometer-Calibrator/dp/B00GUYCNMS

 

Cool so mine need those bars ty

 

you got a awesome truck friend thank you for your help

 

FFV stands for Flex Fuel Vehicle, meaning you can run E85 ethanol gas in it. Although not recommended.

I'm sure that vehicle has not been regeared and that would be about the only way to recoup some of the lost MPG's out of it, other than putting it back on stock tires of course.

 

Wally sir it comes with 4:30 rear fears I read that that was good gears. Do you think that's okay?

 

Yes most people regear once you go to 35+ I have had mine done. They have 4.88s and 5.29
I would recommend 5.29 that seems to be the most common for our tire sizes. It can get pricey mine was 1800 after installation
Although the only guys on here that I have seen with transmission issues have 12" lifts with 40" tires

 

Im still running stock gearing on 37s.... but will hopefully be going 5.29s if I ever get a reply back from nitro gears. Also, I get 12.5 mpg but baby it every step of the way, so as long as you don't try to drive it like a sports car(which it is not) then your mpg will improve some. These were not designed to be great mpg vehicles so anything you do to them will only improve the mpg minimally and usually isn't cost effective.

 

Are 5.29 gears good for highway driving also or will they hurt my transmission?

 

What will "hurt" your truck in the long run is not regearing. You'll hear people say they have been running stock gearing, blah,blah and they haven't had any issues.... yet. It is putting everything under a strain. With 37s, 5.29 is the closest you can get to stock gearing. It would actually be 5.01, or 5.11... can't remember now, but they don't make that or anything else except for 4.88 and 5.29 for us. Plenty of threads covering this question and concerns.

 

TX TUNDRA is there a way to know what my gear ratio is? My truck had a previowner and I don't know what they did to it. I drove it on the highway 3 hours away from where I live and same path back and checked divided my mileage from tripometer I set. And it said I was getting 11mpg..i drove 70mph I was tolf my trucks not giving me the right mpg reading on my dash it said 9.3mpg.. with the bully dog platinum gt Gas tuner if i calibrate the tires to the speedometer would that fix my reading also sir?

 

There were only two gear ratios from the factory that im aware of. One is 4.30 with the tow package and in not sure about the other