BFG tires

[chevyguy3766]

ok when i first got my truck, i had 265 uniroyal tires on her. about a month ago i just got a brand new set of 285 BFG allterain. nice tires, i havent tried them out in the mud yet. anyway, before i got the tires i could go about 460 miles on a tank. now its barely 400. i know the bigger tire makes a difference but is this normal. i just changed my fuel and air fliter and seafomed her a couple months ago. is there anything else i can do to get a little bit of my mpg back?

[shsportsfan12]

What else has been done to the truck? Still sounds decent to me... I was averaging 200-220 miles to a tank and got it up to 280-300ish through a lot of different things

[chevyguy3766]

thats all, the truck is completely stock. its a 97 4dr 4x4 with about 146000 miles. i bought her last july, the only thing ive done to her is new tires and a alarm system.

[shsportsfan12]

Look into an exhaust, intake, and tune. Should help get some air moving and help you out overall.

[Grebbler]

What are you using to measure mileage? Did you get the speedometer re-calibrated?

[Sepiroth]

Yea youre going to have a drop in mileage. The uniroyals that were on it before were light compared to the BFG.

You have to remember the BFG has a 3 ply sidewall and deep grooves and siping. It's a heavier tire. Prolly about the weight of 1 and a half of your old uniroyals. So you will notice a drop in mileage.

[Bad bow tie]

Yea youre going to have a drop in mileage. The uniroyals that were on it before were light compared to the BFG.

You have to remember the BFG has a 3 ply sidewall and deep grooves and siping. It's a heavier tire. Prolly about the weight of 1 and a half of your old uniroyals. So you will notice a drop in mileage.

Not to mention they are more agressive which will also drop your milage.

And with my experince with the All Terrians, they are terrible in deep soupy mud. I've had them on 3 trucks and know a lot of people with them on. When it comes to mud, these tires do a crappy job of evacuating the mud from the tread block. I am also running them and love the hell out of them, but won't take them in soupy mud. However, they are excellent in all other terrains and look bad ass too.

[992door]

What are you using to measure mileage? Did you get the speedometer re-calibrated?

Yea re-calibrate your speedometer and then see what you are at

[hapyspaz]

Yea re-calibrate your speedometer and then see what you are at

Assuming your Uniroyals were worn down to 31" and your BFG's are 33"...

432 miles on your odomoter should = 460 miles.
400 miles on your odomoter should = 426 miles.

As others stated, you have a heavier tire now. You really only lost 34 miles a tank, and if you are getting 400+ on your truck you are probably MUCH better off than the rest of us. I know I get about 375 and thats with a decent amount of highway driving.

[sloppydrippins]

From what I've learned, any kind of knobby all terrain tire is definitely going to negatively affect your mpg. I have lt265 75R16's and I'm gonna sell them and put highway tires back on because i gotta commute in it and gas is going back up again.

Check out Trucks on SpikeTV or their website. They list 5 things that will improve the mileage on any vehicle. From what I remember they are:

1. Cold air kit
2. E3 spark plugs
3. headers/free flow exhaust
4. Royal Purple lubes throughout your vehicle
5. A new chip (I think)

Hope this helps ya

[hapyspaz]

Cold Air Kits are a waste of money :imo: . Most cold air kits will actually hurt your mpg unless you have modified and boosted the power on your vehicle. Switching to a K&N or similar filter will most definately improve your MPG if used properly.

[Sepiroth]

Can you prove your statement?

[hapyspaz]

Can you prove your statement?

There are varying opinions when it comes to this. I am going to try to cover both aspects here.

Air Intake Tube:
A performance air intake replaces your stock intake tube with a wider pipe that has fewer bends. The result is a higher volume of air that flows more freely. The resulting effect fills your combustion chamber with more oxygen molecules for igniting fuel at a balanced, efficient mixtures that maximize power and an increase in fuel economy.

Cold Air:
Taking in cooler air for combustion means an air mixture that's denser with oxygen molecules for a better burn and ultimately more power.

Do cold air intakes increase mpg? The answer is Yes! performance air intakes, help your engine to work more efficiently. The power of an engine is directly proportional to the amount of air drawn into a cylinder and retained until ignition. To increase the engine power, increase the airflow capacity, and or the air-fuel charge which must be burned more effectively. Most factory engines "volumetric efficiency" is a compromise between fuel economy, efficiency, reliability,noise and performance.

Some cars' engine control units (ECUs) adjust the air/fuel mixture based partly on readings from the intake air temperature (IAT) sensor. The warmer the air, the leaner the mixture. Warm air is less dense than cold air.

"The air is less dense, so you get less horsepower at the same throttle opening, thus, you have to open the throttle wider to let in more air and get the horsepower that you need. That increases the efficiency because one of the primary causes of the well-known part load inefficiency of gasoline engines is the throttle loss."

I want to dive further into this, and put up some statistics and such, but I dont have time for it today, and thats a whole other thread to start.

The jist of what Im saying is this:
Higher volume air filter --> Better MPG
Air intake tube (more flow) --> Better MPG
Colder air entering intake --> Better HP

The "cold" air kits do increase MPG, but only because 90% of them dont provide cold air, just more air. Warm air is good for fuel efficiency, why do you think the only factory installed cold air kits are on high performance vehicles?

Increasing the efficiency of air flow in AND out of your engine will provide better MPG, how you go about increasing it is up to you.