poor mpg someone help!!!!

I recently had 265 75 16 e rated kevlar tires with a leveling kit on a 2004 tacoma 3.4 , gas mileage went down bad then I did my plugs cleaned the throttle body good and maf what else can I do to fix this sorry couldnt search the forum phone wont let me thanks any advice will help

 

define bad, any actual numbers?

 

Installing larger size tires throws off your speed/odo. The odo will read fewer miles than you actually drove. What size tires did they replace?

 

try cleaning the upper cylinders (seafoam), cleaning the injectors (concentrated techron or Redline SI-1 (redline has highest PEA of any cleaner)(PEA is the injector cleaning solvent)(avaliable at oriellys)

When did you last change your fuel filter?

What is your tire pressure?

Hows your brakes? do you have a sticking caliper?

When did you last grease your driveline, and change gear fluids?

When did you last change your air filter?

When were O2 sensors changed?

Where do you get your gas? Is it a reputable brand, or is it a no-name gas station in the sticks?


Theres a variety of things that come into play when trying to maintain good fuel economy.

 

Fuel filter idk got it from grandfather I might have a sticking caliper idk 02 sensors never been changed gas is from heb bore do I grease driveline
I'll try sea foam and that stuff!

 

I got 33 12.5 15 before that had 265 75 16 e rated I get about 60 to 70 miles on half of a tank

 

What % larger are the new tires than the old? did you adjust for that when you figured gas mileage? also the added weight of the larger tires will effect mileage. You can do all the standard things to improve the engine efficiency but you won't get back to the original MPG with the bigger heavier tires.

 

so you have a 4.4% difference in overall height, but you added 20% to the width. How many gallons is half a tank?

 

When I put 20 dollars it'll go to halfway at around 7 gallons not sure if it right someone told me it could be wrong

 

And the gas-hand on the dash is not 100% correct

 

I think the main issue is that the new 33's are far heavier and slightly taller than the old tires. you should fill up, and check how far off your odometer is by checking over a known distance or with a gps app. then see what your real MPG is. I would also check to see if the pressures are correct in the tires. with that much tire width your alignment might be off as well.

 

Your saying its not?

 

Do yall think my needle could be wrong?

 

It could be wrong (mine doesn't move evenly or at all until I drive 80 miles or so) but you should be able to see what your mpg is anyway.

 

I drove 60 miles on full before it moved down.

 

I would do all maintenance and checks mentioned above. Then fill the tank, drive a hundred or so miles, refill the tank, and calculate the mileage. Then you'll know what your tires are really costing you

Seriously, get your speedo adjusted!

 

Guys it's fairly simple. He's running an E-rated tire, a tire designed for V8 Full size quad cab trucks designed to tow 12,000 - 15,000 + lbs and transport trucks like UPS and Fedex trucks. This is the reason why it makes no sense unless you are heavily into rock crawling to run these kind of tires. These are puny little 190 HP V6 trucks.

Besides regular maintenance and up keep, if you want better MPG you need to go to a passenger or lower Load range tire. Simple as that.

 

^ This. Why would you get E-rated (10 ply) tires for a light truck? I use a C (6 ply) or at the most a D (8 ply). The ride is much better too. A 10 ply tire will be much stiffer.

 

Some tires only come in some sizes in E rated