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You are wrong.
Bigger the diameter -> lower the RPM for the same speed -> better MPG
Bigger the diameter, the more rotating inertia, the more power it takes to rotate the un-sprung mass, hence the worse MPG you get. There is far more to MPG than just RPM, you could save gas if the tire where really light, but chances are you would spend more on the rims/tires than you will save in gas.
My GS-R can get 40 MPG and cruises at 4,000 RPM at 70 MPH.
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So let me get this straight, you're an engineer with a PhD and you bought a 4 year old civic and doesn't know how to spell engineer or engine?
BTW, sulfur is not the only thing that clogs injectors and Europe has FAR lower sulfur in their gas than the US, hence the reason they've had direct fuel injection for the last 10 years and the US has not.
I am just temporary in USA, and my native language is not english. The english is my fift language. So I gues is not that bad. Some of you know just english. So don't try to be brave. Spelling mistakes are not that bad that make the mesages unreadable. Sory for you.
Bigger the diameter, the more rotating inertia, the more power it takes to rotate the un-sprung mass, hence the worse MPG you get. There is far more to MPG than just RPM, you could save gas if the tire where really light, but chances are you would spend more on the rims/tires than you will save in gas.
My GS-R can get 40 MPG and cruises at 4,000 RPM at 70 MPH.
Yes I agree with some of the statements. The more rotating inertia is evident in city driming, less in Hwy driving.
Hey guys, put your MPG and tire diameter in the post so we can judge.
Yes I agree with some of the statements. The more rotating inertia is evident in city driming, less in Hwy driving.
Hey guys, put your MPG and tire diameter in the post so we can judge.
You are correct, it is more evident in the city, but without actually knowing the weight of the tire and rim (or actually the moment of interia) the number will not matter much. And I'm guessing very few people actually know the moment of interia of the setup.
Agian like I said, it's possible to get bigger tires, with lower moment of interia, but you are going to spend a bit of money to get the high quality rims like that.
I am just temporary in USA, and my native language is not english. The english is my fift language. So I gues is not that bad. Some of you know just english. So don't try to be brave. Spelling mistakes are not that bad that make the mesages unreadable. Sory for you.
hummm.... yeah I can see that. So what is your native language? You say you know 5, but I'm going to guess you are Indian, because most Indians I know have to learn 3 languages by the time they go college, just a guess though Good job being able to learn so many languages, I personally am only working on my third, grad school is just way to time consuming.
You are correct, it is more evident in the city, but without actually knowing the weight of the tire and rim (or actually the moment of interia) the number will not matter much. And I'm guessing very few people actually know the moment of interia of the setup.
Agian like I said, it's possible to get bigger tires, with lower moment of interia, but you are going to spend a bit of money to get the high quality rims like that.
Bigger the diameter, the more rotating inertia, the more power it takes to rotate the un-sprung mass, hence the worse MPG you get. There is far more to MPG than just RPM, you could save gas if the tire where really light, but chances are you would spend more on the rims/tires than you will save in gas.
My GS-R can get 40 MPG and cruises at 4,000 RPM at 70 MPH.
rotating mass
not unsprung mass. although the wheels are unsprung mass, unsprung mass has nothing to do with mpg because its all the same weight your pulling, its the rotating mass that concerns you because thats what you need to turn to get rolling.
i know you already know this but some wont and you just worded your statement wrong.
Just turned 1100 miles and I check the in town mileage and got 29.78 MPG, close enough to 30 to make me grin because my previous V6 Mustang got 16 in town and 21 on the hwy. I don't drive 'hard' but I don't exactly baby it either. Anxious to check mileage on the hwy and no doubt it will get 40 like it should. Very nice car and we really like the economy and how roomy it is and well built. Not one squeak or rattle and absoultely nothing wrong with it since day one.
rotating mass
not unsprung mass. although the wheels are unsprung mass, unsprung mass has nothing to do with mpg because its all the same weight your pulling, its the rotating mass that concerns you because thats what you need to turn to get rolling.
i know you already know this but some wont and you just worded your statement wrong.
Well, I was refering to the rim/tire, brake rotors and all that stuff. You could theoretically save gas by switching to say a Titanium rotor, but I think the cost be a problem But yeah, you're right, we're only talking about the tire/rim here.
Good job being able to learn so many languages, I personally am only working on my third, grad school is just way to time consuming. 
But yeah, you're right, we're only talking about the tire/rim here. 
