20's and mpg?
Nov 9, 2007 | 04:26 PM
#62
Launching!
Joined: Sep 2003
Posts: 261
Likes: 0
From: Northridge, Ca
noo...this is...
..... I just did a round trip of 300miles, 99% of which was highway and have the MPG drop to show that heavy 20" rims hurt fuel economy, all of this was done with the cruse set so my "heavy foot" had nothing to do with it. I have previously done this same trip and seen better economy with the old 16s.
..... I just did a round trip of 300miles, 99% of which was highway and have the MPG drop to show that heavy 20" rims hurt fuel economy, all of this was done with the cruse set so my "heavy foot" had nothing to do with it. I have previously done this same trip and seen better economy with the old 16s.Plus anything over 65mph is just waste of gas.
Remember guys im not talking about city driving where there is alot of stop and go, this is where the taller rim/tire combo is at its weakest. Im talking about 65mph long cruise none stop and you will gain with taller rim/tire combo.
Nov 9, 2007 | 04:38 PM
#63
I set mine at cuise control at 65mph. What did you set yours at?
Plus anything over 65mph is just waste of gas.
Remember guys im not talking about city driving where there is alot of stop and go, this is where the taller rim/tire combo is at its weakest. Im talking about 65mph long cruise none stop and you will gain with taller rim/tire combo.
Plus anything over 65mph is just waste of gas.
Remember guys im not talking about city driving where there is alot of stop and go, this is where the taller rim/tire combo is at its weakest. Im talking about 65mph long cruise none stop and you will gain with taller rim/tire combo.
Nov 9, 2007 | 06:49 PM
#65
...this trip has ALWAYS been run at 80mph so my "test" truly IS an HONEST comparison (same truck, same time of year, same way, etc.)....sure I burn more fuel at 80 than I would at 65 but we are not talking about what is the best MPH to drive for fuel economy, we are discussing if tire size offsets the weight of 20rims....my results (along with everyone but yourself) say no they do not...but anyways.....you have it set in your mind that big wheels ALWAYS give better MPG and my guess is you will fudge the test to fit (you will see what you WANT to see), so have at it.....go prove us wrong...
Last edited by 2001CamaroGuy; Nov 9, 2007 at 06:56 PM.
Nov 9, 2007 | 07:04 PM
#66
Registered User
Joined: Oct 2007
Posts: 11
Likes: 0
I don't understand the heated debate. I seems like everything Freakenhye has said has been consistant and comes down to a few basic points. To paraphrase:
1) At a steady speed, rotating mass has virtually no effect on power consumption and efficiency. At a steady speed, it doesn't matter if your rims weigh 2 lbs or 200.
BUT...
2) While accelerating, rotating mass has a noticable effect on power consumption and efficiency. Your ride on heavy wheels will be slower and use more gas in the city and at the drag strip. This will probably lower your overall mpg as well.
3) A larger outside diameter tire is generally better on the highway (within limits) because it effectively gives you taller gearing. I don't think anyone questions this. The trucks with 44 inch mudders have such bad aerodynamics that they probably get poor highway mileage to match their city mileage.
Your wheel/tire is like a flywheel in some ways.
Light ones rev up and slow down quicker.
Light ones store less kinetic energy.
At a steady speed, heavy or light ones do not consume energy.
There are other minor variables when you change wheels, like rolling resistance in the tire and aero effects but for our comparison we have ignore them.
1) At a steady speed, rotating mass has virtually no effect on power consumption and efficiency. At a steady speed, it doesn't matter if your rims weigh 2 lbs or 200.
BUT...
2) While accelerating, rotating mass has a noticable effect on power consumption and efficiency. Your ride on heavy wheels will be slower and use more gas in the city and at the drag strip. This will probably lower your overall mpg as well.
3) A larger outside diameter tire is generally better on the highway (within limits) because it effectively gives you taller gearing. I don't think anyone questions this. The trucks with 44 inch mudders have such bad aerodynamics that they probably get poor highway mileage to match their city mileage.
Your wheel/tire is like a flywheel in some ways.
Light ones rev up and slow down quicker.
Light ones store less kinetic energy.
At a steady speed, heavy or light ones do not consume energy.
There are other minor variables when you change wheels, like rolling resistance in the tire and aero effects but for our comparison we have ignore them.
Nov 9, 2007 | 08:43 PM
#70
TECH Fanatic
Joined: Aug 2004
Posts: 1,814
Likes: 0
From: Las Vegas, NV
