20" vs 18" Affecting gas mileage - Mustang Evolution

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Old 05-06-2013, 06:31 PM   #1
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20" vs 18" Affecting gas mileage

This might sound silly but I would like to know the actual reason why gas mialeage is affected by switching from 18s to 20s

I use to have the base 18s on my 2013 mustang which were 255/55/18 all around and now I have 275/35/20 front 295/35/20. I'm wasting 3 to 4 miles avg more, this ofcourse when I was stock.
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Old 05-06-2013, 06:53 PM   #2
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Well part is tire width, you are now running wider tires which equals more resistance. Also over all tire height has probably changed, also which is effecting odometer reading.
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Old 05-06-2013, 07:15 PM   #3
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In addition to the width increase causing more resistance, what's the weight difference between stock and the 20s?
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Old 05-06-2013, 07:36 PM   #4
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More rotating weight, the reason your drag times increased. An aluminum DS will make up some of it.
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Old 05-06-2013, 07:42 PM   #5
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Old 05-06-2013, 07:46 PM   #6
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That picture shows how you changed your tire size and the effect it has on your car. ( speed odometer and fuel mileage).
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Old 05-06-2013, 07:48 PM   #7
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Originally Posted by tc x 4 View Post
More rotating mass, the reason your drag times increased. An aluminum DS will make up some of it.
You mean decreased right? Because with the 20s I ran slower....

---------- Post added at 06:48 PM ---------- Previous post was at 06:47 PM ----------

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That picture shows how you changed your tire size and the effect it has on your car. ( speed odometer and fuel mileage).
I cant see it in my phone, will check it out soon
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Old 05-06-2013, 08:00 PM   #8
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Can u send me the site because the stock were 235/50/18, i mest up
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Old 05-06-2013, 08:02 PM   #9
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Quote:
Originally Posted by OzzyLiriano

You mean decreased right? Because with the 20s I ran slower....

---------- Post added at 06:48 PM ---------- Previous post was at 06:47 PM ----------



I cant see it in my phone, will check it out soon
If you ran slower, your time increased. His picture shows your new tires being an inch shorter and an inch&half wider. You speed at 65mph is actually 62.x mph.

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Can u send me the site because the stock were 235/50/18, i mest up
Tacoma world.com
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Old 05-06-2013, 08:29 PM   #10
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I used this site to find out what the difference was in the tires you used. http://www.miata.net/garage/tirecalc.html
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Old 05-06-2013, 08:49 PM   #11
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i don't know alot about this but don't you have to recalibrate your speedometer? i would think bigger or smaller size tire compared to what Ford recommends for your car would throw gas mile and MPG's off.. not 100% on that.
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Old 05-06-2013, 08:52 PM   #12
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Originally Posted by Bong Toke Bobby
i don't know alot about this but don't you have to recalibrate your speedometer? i would think bigger or smaller size tire compared to what Ford recommends for your car would throw gas mile and MPG's off.. not 100% on that.
Ya, you change your revs per mile on a handheld tuner.
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Old 05-06-2013, 09:10 PM   #13
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Originally Posted by tc x 4 View Post

Ya, you change your revs per mile on a handheld tuner.
I changed it after I got the tuner, I was just asking if it does affect or not, I also read that 20s kill my gears more
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Old 05-06-2013, 09:21 PM   #14
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I changed it after I got the tuner, I was just asking if it does affect or not, I also read that 20s kill my gears more
20s pretty much make every aspect of your performance go down. But they look really good. For almost any Mustang 18s are the best compromise for looks and performance.
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Old 05-07-2013, 04:17 AM   #15
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Weight and increased load from the inertia is a big factor. Larger wheels usually weigh much more. The decreased sidewall height will also make your launches worse, all things being equal.
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Old 05-07-2013, 09:21 AM   #16
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While the weight and rolling resistance increases have small effects on mileage, for the most part the mileage hit mainly comes from miscalculation of revs per mile due to the increased circumference. The big wheel spins slower than a smaller wheel, adding up to less miles indicated for your mileage calculation, if you haven't compensated correctly for it.

Actually getting revs per mile right is near impossible. You can rough guesstimate it but, the flexibility of the circle and slippage complicates exact measure. I do it by painting a grease spot on the tread, rolling the car forward then measuring the distance between the centres of the grease spots. That's as close to your actual rolling circumference as you can realistically get.
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Old 05-07-2013, 09:57 AM   #17
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While the weight and rolling resistance increases have small effects on mileage, for the most part the mileage hit mainly comes from miscalculation of revs per mile due to the increased circumference. The big wheel spins slower than a smaller wheel, adding up to less miles indicated for your mileage calculation, if you haven't compensated correctly for it.

Actually getting revs per mile right is near impossible. You can rough guesstimate it but, the flexibility of the circle and slippage complicates exact measure. I do it by painting a grease spot on the tread, rolling the car forward then measuring the distance between the centres of the grease spots. That's as close to your actual rolling circumference as you can realistically get.
Thanks, do you think the 20s affect your/mine gears in any way?

Reason im asking is, i use to light up my stocks in smoke easily, now with these 20s i can even create a bit of smoke! even with traction off..i have 3.15 gears
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Old 05-07-2013, 10:22 AM   #18
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They don't affect your gears, they affect your overall gear ratio. For example, going from a 26" tire to a 28" tire on my 3.73 drops the net ratio at the road to about 3.45:1 from 3.73:1. I did this to ease launch stress and to keep the car in 4th through the stripe.

Obviously, tire differences will also affect your ability to make smoke with them or not.
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Old 05-07-2013, 10:25 AM   #19
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Originally Posted by 5LHO
They don't affect your gears, they affect your overall gear ratio. For example, going from a 26" tire to a 28" tire on my 3.73 drops the net ratio at the road to about 3.45:1 from 3.73:1. I did this to ease launch stress and to keep the car in 4th through the stripe.

Obviously, tire differences will also affect your ability to make smoke with them or not.
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Old 05-07-2013, 01:05 PM   #20
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Originally Posted by 5LHO View Post
They don't affect your gears, they affect your overall gear ratio. For example, going from a 26" tire to a 28" tire on my 3.73 drops the net ratio at the road to about 3.45:1 from 3.73:1. I did this to ease launch stress and to keep the car in 4th through the stripe.

Obviously, tire differences will also affect your ability to make smoke with them or not.
Thank you sir, this is exactly what i wanted to know, so going to 3.73 is a better idea than 4.10 for the strip?
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Old 05-07-2013, 05:37 PM   #21
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Thank you sir, this is exactly what i wanted to know, so going to 3.73 is a better idea than 4.10 for the strip?
Are you auto or manual?
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Old 05-07-2013, 08:54 PM   #22
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Are you auto or manual?
Auto
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Old 05-07-2013, 09:07 PM   #23
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Auto
he is going to tell you 3.31, just watch.
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Old 05-08-2013, 12:35 AM   #24
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he is going to tell you 3.31, just watch.
That coupled with a 28" tire will have him crossing the traps at the top of 3rd.
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Old 05-08-2013, 12:43 AM   #25
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That coupled with a 28" tire will have him crossing the traps at the top of 3rd.
Forgot to say the 28" tire part haha. Could have called that a mile away.
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Old 05-08-2013, 12:55 AM   #26
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Forgot to say the 28" tire part haha. Could have called that a mile away.
Why? thats what he has?
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Old 05-08-2013, 05:20 AM   #27
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Why? thats what he has?
Nope. I'm on stock 3.15's and will remain that way. 3.73's or 4.10's are not going to make your car any faster at the strip and with the shift into 4th with anything over 3.31's may even slow you down more. The goal is to pass the stripe at the top of your rpm range, not at 6200 or so with these cars which is what will happen.
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Old 05-08-2013, 07:12 AM   #28
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Thank you sir, this is exactly what i wanted to know, so going to 3.73 is a better idea than 4.10 for the strip?
I would do 3.73 with your tire height.
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Old 05-08-2013, 02:05 PM   #29
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Nope. I'm on stock 3.15's and will remain that way. 3.73's or 4.10's are not going to make your car any faster at the strip and with the shift into 4th with anything over 3.31's may even slow you down more. The goal is to pass the stripe at the top of your rpm range, not at 6200 or so with these cars which is what will happen.
Well my rims and tires are the main cause that i ran slower, according to a lot of ppl i spoke to, they suggested 3.73 if i wanted to stay with 20s, just ordered bmr sway bar relocation brackets and i got some racing tires, lets see
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Old 05-08-2013, 03:37 PM   #30
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Well my rims and tires are the main cause that i ran slower, according to a lot of ppl i spoke to, they suggested 3.73 if i wanted to stay with 20s, just ordered bmr sway bar relocation brackets and i got some racing tires, lets see
Without question your wheels and tires aren't helping any. Out of curiosity do any of these people own and or tested 3.73's in an auto? Sway bar relocation brackets are only necessary when you want to run a 15"x10" wheel. Which 15" wheels will you be running?
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Old 05-08-2013, 11:48 PM   #31
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Without question your wheels and tires aren't helping any. Out of curiosity do any of these people own and or tested 3.73's in an auto? Sway bar relocation brackets are only necessary when you want to run a 15"x10" wheel. Which 15" wheels will you be running?
I've got 3.73's in my auto with the same tire and rim size as him.
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Old 05-09-2013, 12:06 AM   #32
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Without question your wheels and tires aren't helping any. Out of curiosity do any of these people own and or tested 3.73's in an auto? Sway bar relocation brackets are only necessary when you want to run a 15"x10" wheel. Which 15" wheels will you be running?
No, the autos were 4.10, but since im going paxton they told me either to stay 3.15 or for now to do 3.73and consider going back couple years from now when im reading for fi
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Old 05-09-2013, 05:11 AM   #33
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He picked up the SVE drag wheels in 15x10 right before they stopped selling them. He's set for the track now. When you go put the stock front wheels/tires on also. You can also pull your side view mirrors in like 5 minutes if you wanna get crazy about it lol.
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Old 05-09-2013, 07:15 PM   #34
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He picked up the SVE drag wheels in 15x10 right before they stopped selling them. He's set for the track now. When you go put the stock front wheels/tires on also. You can also pull your side view mirrors in like 5 minutes if you wanna get crazy about it lol.
Lol thats a good one, im going to denver now, ill be back soon to my sunshine state to run it..ill keep u guys posted
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Old 05-10-2013, 12:12 AM   #35
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After extensive research, i either go higher than 4.10 with a stall converter, or 3.55. What do yall think?
The guys i spoke to before are experienced drivers, but they all drive 4.6..so i spoke to some auto guys.
I plan to stay n/a for a while, i have 3.15 now and my goal is to run 11....for now lol
Its either i stay 3.15, or go 3.55, or higher than 4.10, but i like to go on road trips on the stang so that last option is my last pick.
I also want something to be able to move these damn 20s, ill post up their hieght tomorrow, see if one of you guys have any inputs.
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