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Convince Me That I'm Wrong About My Gas Mileage #413462 Mar 7, 7:23pm Mar 7, 7:23pm
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Convince Me That I'm Wrong About My Gas Mileage
Ok guys I've read some posts that stock rims actually help your gas mileage compared to the larger rims. I'm somewhat thinking the opposite and I'm just wondering, have I gone crazy or does it make sense.

Basically when I drive, I never past 3k. I shift at 3k or below. Maybe once or twice I'll take it up to redline for 1 gear.

My thing is the gas mileage in the 2002 gts. I'm only getting around 325 miles using about 12 out of the 14.5 gallons. This doesn't seem right to me unless I'm just crazy. I have on 18's right now and was thinking, if I go back to the stock 16's it'll improve the gas mileage a bit.

During the week I rarely ever hit traffic, I drive home when there is minimal traffic to no traffic at all. As for city driving, i usually drive stop and go for around 10 miles a day.

My question is, isn't it better to have the 18's on if I'm never in traffic and all the miles are freeway miles? My hypothesis is that lighter tires will be better for stop and go since it will take less amount of force to get the tires moving from a stop and go. And it would be better for freway with the 18's because it's in motion. When thinking about the physics, wouldn't a heavier object already in motion take less force to move it since it would have more momentum opposed to a lighter tire? Tell me I'm crazy and that the lighter tires will improve gas mileage and be better confused

Re: Convince Me That I'm Wrong About My Gas Mileage [Re: WhiteCeli] #413463 Mar 7, 7:33pm Mar 7, 7:33pm
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hmm. small rims are better. it takes less power to have it, how do you say, move the car. smaller diameter requires less energy to move the car. but then again, if this is a major concern for you, your best bet is to return to stock.


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Re: Convince Me That I'm Wrong About My Gas Mileage [Re: Zero] #413464 Mar 7, 7:33pm Mar 7, 7:33pm
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and you're crazy grin wave


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Re: Convince Me That I'm Wrong About My Gas Mileage [Re: Zero] #413465 Mar 7, 7:37pm Mar 7, 7:37pm
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Originally Posted by Zero
hmm. small rims are better. it takes less power to have it, how do you say, move the car. smaller diameter requires less energy to move the car. but then again, if this is a major concern for you, your best bet is to return to stock.


i'm just using an example. Say you were to drop a pebble and a boulder at the same time from the top of the building, the boulder would fall faster until they both reach terminal velocity which I forgot what it was, i think 9.8 m/s. But neway that's why I'm thinking larger rims would be better for freeway. Since there would be a greater momentum force therefore using less enegery to turn the wheel each revolution.

And yes i think i'm going crazy because I'm analyzing this so much

Re: Convince Me That I'm Wrong About My Gas Mileage [Re: WhiteCeli] #413466 Mar 7, 7:40pm Mar 7, 7:40pm
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wow. i dont know anymore rofl


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Re: Convince Me That I'm Wrong About My Gas Mileage [Re: Zero] #413467 Mar 7, 7:58pm Mar 7, 7:58pm
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http://ks.essortment.com/waystoimprove_rryi.htm

Might provide some insight in to your question I guess... idunno

Re: Convince Me That I'm Wrong About My Gas Mileage [Re: beano457] #413468 Mar 7, 8:01pm Mar 7, 8:01pm
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after reading that, my question still unanswered. I see all the logic behind that article but yet I just want an answer to my question with a good explanation why I'm crazy for even thinking that. I know that there's other factors involved, but I'm doing this from just the standpoint of the rims.

Re: Convince Me That I'm Wrong About My Gas Mileage [Re: WhiteCeli] #413469 Mar 7, 8:14pm Mar 7, 8:14pm
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You were way off about that terminal velocity thing. Terminal velocity is the maximum achievable velocity of a falling object and is directly related to its mass. 9.8m/s is the gravitational acceleration placed on an object in the Earth's atmosphere. Thus, when you drop an object, its acceleration rate is 9.8m/s. Weight is measure in a similar fashion: mass * gravitational acceleration = weight. Hence why things weigh differently on other planets, but retain the same [n]mass[/b]. In your example, the boulder would accelerate at the same rate as the pebble, however it would eventually reach a higher speed. The small pebble would not go as fast, thus why a penny dropped off the Sears Tower won't actually kill anyone. Also, you can drop an ant off the building and it would live, assuming you were able to find it afterwards.


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Re: Convince Me That I'm Wrong About My Gas Mileage [Re: combatc87] #413470 Mar 7, 8:29pm Mar 7, 8:29pm
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Originally Posted by combatc87
You were way off about that terminal velocity thing. Terminal velocity is the maximum achievable velocity of a falling object and is directly related to its mass. 9.8m/s is the gravitational acceleration placed on an object in the Earth's atmosphere. Thus, when you drop an object, its acceleration rate is 9.8m/s. Weight is measure in a similar fashion: mass * gravitational acceleration = weight. Hence why things weigh differently on other planets, but retain the same [n]mass[/b]. In your example, the boulder would accelerate at the same rate as the pebble, however it would eventually reach a higher speed. The small pebble would not go as fast, thus why a penny dropped off the Sears Tower won't actually kill anyone. Also, you can drop an ant off the building and it would live, assuming you were able to find it afterwards.


i knew 9.8 m/s didn't seem right grin thank you for the physics refresher...it's been 1 year and a lot of forgotten things grin

Ok, so does anyone have an explanation for my theory aside from the boulder/pebble example?

Re: Convince Me That I'm Wrong About My Gas Mileage [Re: WhiteCeli] #413471 Mar 7, 8:36pm Mar 7, 8:36pm
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Well, heavier rims mean your engine has to work harder than stock to run at certain speeds. It may not feel like it is, but it is. Think about pulling a wagon. Then add about 2 pounds to it. You wont realize it, but it does require more work to pull. It makes little difference then and there, but as time goes on, you'll start to notice. Same deal with your car. The heavier rims will require more gas in the long run theoretically, but the weight difference is so negligable that there are many other effects on gas mileage that will likely cause the difference.


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Re: Convince Me That I'm Wrong About My Gas Mileage [Re: combatc87] #413472 Mar 7, 9:13pm Mar 7, 9:13pm
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Quote:

Generally, automakers keep in mind torque applied to the ground and fuel economy. If you change the diameter of the wheel and tire combo, you also change the amount of torque applied to the ground from your vehicles engine. We'll say that at 20 MPH, we are at 3500 rpm with factory tires in 1st gear. So - we change to a smaller diameter wheel/tire combo, and then we now see that we are at 20 MPH (not indicated by the speedometer, because the speedometer is now inaccurate), but we are at maybe 4000 rpm. This would allow our cars to accelerate through the gears faster (because they would effectively be shorter gears) without really accelerating in speed, although it may promote more wheelspin amongst other things. This would also affect cruising speed on say the highway. Instead of being at we'll say 3000 rpm for 60 mph, now you may be at 3200 or 3500 rpm. This can have an effect on gas mileage too


Taken from http://www.daveblack.net/asp/TirePlusSizing.asp

This is begining to feel like one of the problems that seems as if there are really no definite answers. confused

Re: Convince Me That I'm Wrong About My Gas Mileage [Re: beano457] #413473 Mar 7, 9:52pm Mar 7, 9:52pm
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I get bout 27-30mpg and I keep my car between 3 and 4k.

Re: Convince Me That I'm Wrong About My Gas Mileage [Re: Poisoner] #413474 Mar 7, 11:10pm Mar 7, 11:10pm
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i get about 300 mile for a full gas of tank on street and about 330 on highway..


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Re: Convince Me That I'm Wrong About My Gas Mileage [Re: WhiteCeli] #413475 Mar 7, 11:23pm Mar 7, 11:23pm
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i guess the only real way for find out is get my lazy butt up and switch out the rims, fill up the tank, and see what really does happen wave

the example i should've used was something along the lines of joules.

Re: Convince Me That I'm Wrong About My Gas Mileage [Re: WhiteCeli] #413476 Mar 8, 12:30am Mar 8, 12:30am
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I get over 400 on stock rims, I have a long comute of open road though, and I shift between 3k and 4k.


Quote:
Originally posted by stefanoc:


karma will be a bitch

Re: Convince Me That I'm Wrong About My Gas Mileage [Re: WhiteCeli] #413477 Mar 8, 3:37am Mar 8, 3:37am
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imma switch it out this weekend and give it a test run. I'll post up the result in about a week for those who care spineyes

Re: Convince Me That I'm Wrong About My Gas Mileage [Re: Zero] #413478 Mar 8, 5:48am Mar 8, 5:48am
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Originally Posted by Zero
and you're crazy grin wave

rofl

Re: Convince Me That I'm Wrong About My Gas Mileage [Re: bolducda] #413479 Mar 8, 8:44am Mar 8, 8:44am
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I get around 400 miles per tank (thats around 32-33 mpg) with my '04 GTS with stock rims. My driving is mostly highway. I don't think there is much connection to rims/mileage, but I could be wrong. If you've still got stock rims and tires sitting around, it would be great to compare. My suspicion is something else is cutting into your mileage a little, like maybe some sort of fuel injection problem, or something with the plug/plug wires. I'd run some cleaner through the injectors and maybe take it to a shop for an engine analysis. Or it could just be the driving conditions there in Hawaii. Whatever you do, please post back what you find out, and good luck!


300,000 KM/Sec. Its not just a good idea, its the law.
Re: Convince Me That I'm Wrong About My Gas Mileage [Re: ExNihilo] #413480 Mar 11, 6:27pm Mar 11, 6:27pm
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Larger rims and tires equals larger rotational mass. Requires more energy to turn.

If you do get larger rims try to get lighter weight of course and smaller tread on the tire. Like a 205/xx/xx

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