NEED HELP, Trying to increase my MPG!! Please respond!

[Jordanbiird]

This problem is concerning my MPG drop. I went from average city/highway 18 MPG, down to 12.5 MPG after adding new tires/rims.


My stock tires were 37 lbs 265 / 65 / 17 and the new ones i got were 53lb 285 70 17.

Also, my rims which are 17x9, stock weighed 25 lbs, as the aftermarket ones weighed 34 lbs.

So in total, i went from about 248 lbs on stock, and with my new tires/rims i went up to 348 lbs.


My Delema:

I want to keep the tires because of the look it gives the vehichle. I would rather change out the rims.

So my question is: Could i possibly get different rims that weigh less to help my MPG in any significant way? Like i dont know if they even do, but are there aftermarket truck rims that are around 20 lbs?

Or

Do you think the real problem is the tires, and changing my rims to lighter weights would have no affect?

My goal is to get average 15mpg with the 285's but i dont know if its possible...

Thank you so much!


P.S. If getting lighter rims (20lbs) would help my MPG, could you guys link me to any? Thanks a lot!

 

[Seymore Butts]

Your other thread mentioned a lift, which is also a big part of your MPG problem.

Did you do your own mileage calculation or are you still going by the MPG display below the radio?

 

[aabottom]

Consider the tire diameters of the old and new tires. If the new tires have a larger diameter (and therefore a larger circumference), AND if you DO NOT re-calibrate your odometer, then the mileage indicated by the odometer (and the dash MPG reading) will be lower than your actual mileage (and actual MPG). To correct your mileage and MPG, you need to know the diameters of the old and the new tires.

For example, if the old tire diameter is 31", and the new tire diameter is 33", and the MPG reading you get with the new tires is 12.5 mpg, then your correct MPG is:

MPG(correct) = 12.5*33/31 = 13.3 mpg

Likely, this won't account for all the MPG loss, but it can account for some of it.

 

[JeffMerr]

It's mainly your tires. This is the main reason I've avoided the 285 route.

 

[Bossman]

http://www.toyota-4runner.org/4th-gen-t4rs/43439-mpg-drop-lift-tires.html

http://www.toyota-4runner.org/4th-gen-t4rs/235390-lift-tires-wheels-=-terrible-mpgs.html

http://www.toyota-4runner.org/4th-gen-t4rs/226357-low-mpg-out-ideas.html

http://www.toyota-4runner.org/4th-gen-t4rs/204598-mpg-affected-much-tires.html

 

[AuSeeker]

As was mentioned in your other topic, IMHO it would be best to regear your diff/s to regain some of the MPGs or take it all back to stock!

 

[theoutbackdream]

Yes, you can get Enkei RPF1's that weigh 15.9lbs.. Dunno if they make em for our bolt pattern though.

Yes, the real problem is the bigger tires. more rotational mass = more fuel.

Why do you care about MPG's so much. I'm just happy I get more smiles per gallon than a shitty econobox.

 

[Johns06yota]

This problem is concerning my MPG drop. I went from average city/highway 18 MPG, down to 12.5 MPG after adding new tires/rims.


My stock tires were 37 lbs 265 / 65 / 17 and the new ones i got were 53lb 285 70 17.

Also, my rims which are 17x9, stock weighed 25 lbs, as the aftermarket ones weighed 34 lbs.

So in total, i went from about 248 lbs on stock, and with my new tires/rims i went up to 348 lbs.


My Delema:

I want to keep the tires because of the look it gives the vehichle. I would rather change out the rims.

So my question is: Could i possibly get different rims that weigh less to help my MPG in any significant way? Like i dont know if they even do, but are there aftermarket truck rims that are around 20 lbs?

Or

Do you think the real problem is the tires, and changing my rims to lighter weights would have no affect?

My goal is to get average 15mpg with the 285's but i dont know if its possible...

Thank you so much!


P.S. If getting lighter rims (20lbs) would help my MPG, could you guys link me to any? Thanks a lot!

I know the 285's look good but there are several reasons why your mpg would drop so significantly. The wheels really don't do much. My new wheels are in the same weight ballpark as your new ones but surprisingly it increased my gas mileage. The real issues are with the tires. I would imagine for one your new tires are more of an all terrain tire which even at the stock size will drop a few mpg from the more aggresive tread, Next the new width is roughly and inch wider and 2 inches taller which causes more friction on the road than a stock tire size dropping the mpg even more. Then the added weight which tends to be mostly at the tread takes more energy to get into motion causing friction in the drivetrain and further dropping the mpg. Someone else had suggested re-gearing which would probably help but if you really want to see better numbers a 265/70r17 may be the answer. Sorry I know that goes against you wanting to keep the current tires.

 

[riceandpho]

i dont think this guy gets it, with all the tire and suspension mods done, you shouldnt be complaining about mpg. even when i had the 22s on, thats was almost 100 pounds a corner. mpg shouldnt be a problem when you own a truck. but if you cant take it, i change out the suspension and tire combo again for something less aggressive.

 

[IRONLUNG]

Drive like Grandma?














:behindsofa:

 

[Jordanbiird]

I know the 285's look good but there are several reasons why your mpg would drop so significantly. The wheels really don't do much. My new wheels are in the same weight ballpark as your new ones but surprisingly it increased my gas mileage. The real issues are with the tires. I would imagine for one your new tires are more of an all terrain tire which even at the stock size will drop a few mpg from the more aggresive tread, Next the new width is roughly and inch wider and 2 inches taller which causes more friction on the road than a stock tire size dropping the mpg even more. Then the added weight which tends to be mostly at the tread takes more energy to get into motion causing friction in the drivetrain and further dropping the mpg. Someone else had suggested re-gearing which would probably help but if you really want to see better numbers a 265/70r17 may be the answer. Sorry I know that goes against you wanting to keep the current tires.

Thanks guys for all the help, everything all of you said makes complete sense. This is the first time ive ever upgraded to 33" tires on a vehicle, and ive heard a lot of different stores, even some people only dropping like 1 MPG. But Actually right now my MPG reader on my center console is reading 10.5 MPG, which if i convert it, it would be more like 11.5 really... If i already had my dream job MPG wouldnt be a problem, but im still in college. Im driving back home from idaho to colorado tomorrow and just driving home will cost me 120$ in gas, then 120$ to come back up in 2 months lol....

But im debating on getting the same brand tire, They would be Goodyear Duratracs 255 / 75 / 17... Do you guys think those would take me back close to my original mpg? of 17.5? It says on amazon they weigh 43 lbs. My stock tires weighed 37 lbs, and my current 285's weigh 53lbs.

Thanks guys!

 

[Jordanbiird]

Your other thread mentioned a lift, which is also a big part of your MPG problem.

Did you do your own mileage calculation or are you still going by the MPG display below the radio?

Ive been waiting until i drive home tomorrow haha, i will be driving 8 hours, and i will be calculating it no my MPG reader on the center console, and more importantly i will be calculating it using the odometer and how much gas i put in to the 4runner... By the looks of it, ill be lucky to get 13 mpg highway, i guess ill see what happens

 

[Seymore Butts]

Your odometer is no longer accurate, just as your speedometer isn't after installing these huge tires. You're going have to use a GPS assisted mileage calculation or a known distance on a map.

 

[theoutbackdream]

Thanks guys for all the help, everything all of you said makes complete sense. This is the first time ive ever upgraded to 33" tires on a vehicle, and ive heard a lot of different stores, even some people only dropping like 1 MPG. But Actually right now my MPG reader on my center console is reading 10.5 MPG, which if i convert it, it would be more like 11.5 really... If i already had my dream job MPG wouldnt be a problem, but im still in college. Im driving back home from idaho to colorado tomorrow and just driving home will cost me 120$ in gas, then 120$ to come back up in 2 months lol....

But im debating on getting the same brand tire, They would be Goodyear Duratracs 255 / 75 / 17... Do you guys think those would take me back close to my original mpg? of 17.5? It says on amazon they weigh 43 lbs. My stock tires weighed 37 lbs, and my current 285's weigh 53lbs.

Thanks guys!

If you actually do the calculation, and not just base your MPG off the center console, you'll probably realize your MPG didn't take that severe of a hit.

If you really care, just air up the tires to 40psi and hypermile like crazy. It'll give you maybe 1-2mpg. Also, your highway MPG's will be way better than city, especially with bigger tires.

Going 255/75/17 will get you closer.

 

[OzarkRunner]

But im debating on getting the same brand tire, They would be Goodyear Duratracs 255 / 75 / 17...

I just put this exact tire on, and my MPG went from a consistent 16 on Cooper AT3 to 15 with the 255/75 Duratracs (hand calculated and adjusted for size).

 

[BackOff]

If your parking brake is on that would affect MPG.

 

[Drunner97]

Buy a Prius. You gave up your MPG as soon as you started lifting it and putting bigger tires on. Regeared to 4.88s running 315/75/16 KM2s I got an average of 13.5 mpg on a 850ish mile round trip (hand calculated adding 10% to my odo for bigger tires, speedo is about 10% off) Granted I'm also fully armored so I have a ton of extra weight but it is what it is and I have a commuter car to make up for the difference.

 

[falkon240]

Yes, you can get Enkei RPF1's that weigh 15.9lbs.. Dunno if they make em for our bolt pattern though.

Yes, the real problem is the bigger tires. more rotational mass = more fuel.

Why do you care about MPG's so much. I'm just happy I get more smiles per gallon than a shitty econobox.

https://jhpusa.com/collections/enke...wheels-matte-black-18x9-toyota-suv-truck-spec

As for OP.

Disregard the onboard MPG and do your own MPG calculation.

 

[grave]

even when i had the 22s on

 

[Jordanbiird]

I just put this exact tire on, and my MPG went from a consistent 16 on Cooper AT3 to 15 with the 255/75 Duratracs (hand calculated and adjusted for size).

NICE!

Well guys, i have good news, well i guess its atleast better than what i suspected.

So i drove 8 hours on the highway today, and depending on my speed, i got about 15 MPG when i was going above 80, and when i went around 70 or below, i got more like 17 MPG, but the overall trip was 16 MPG which i was really thankful for. I even calculated it myself, and i was suprised to see that my calculations matched up with the MPG tracker on my center console!

Althought i still havent got an alignment for my tires, and i was hauling an extra 300 lbs in my trunk , i bet my MPG would go up even a bit more


So yeah, i get around 16 highway, so i assume ill get near 14 city.