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Old 07-31-2004, 10:35 PM #1
KlassicCrayola
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Ways to add gas mileage?

Are there any relatively cheap ways to add gas mileage?
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Old 07-31-2004, 10:42 PM #2
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Besides for adding more power and not using it so the engine has an eaiser time moving the same mass your driving habits play a lot.The only true ways are to increase the VE(Volumetric Effiency), thermaldynamic effiency or lower the drag coeffienct.
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Old 07-31-2004, 10:54 PM #3
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or drive like at grandpa speed and dont speed up and slow down all the time keep it cruising at a constant rate
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Old 07-31-2004, 11:24 PM #4
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Remove the most weight possible and don't accelerate hard. And drive at a constant speed, drive smoothly, etc.
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Old 07-31-2004, 11:30 PM #5
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or just walk?
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Old 08-01-2004, 12:58 AM #6
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get a tornado air thing..slips right in and gets you 20-30% better effiecentcy
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Old 08-01-2004, 01:16 AM #7
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^....no

F1VENOM, showcasing your knowledge of physics is fine, but you aren't really helping. He said he needs low cost ways for improving gas mileage, so it would be great if you could translate your "fancy" words into something that will be usable to him.

Tires with a larger diameter will help because your engine won't need to spin as fast to go a certain speed. Keep in mind that you will need to get your speedometer recalibrated too because your car will travel faster than the speed shown. Larger tires also increase stability and give a smoother ride.

Keep in mind, that will only be worth it if you were getting new tires soon anyway and/or you put a bunch of miles on your car.
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Old 08-01-2004, 01:39 AM #8
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Quote:
Originally posted by Kyle7257

Tires with a larger diameter will help because your engine won't need to spin as fast to go a certain speed. Keep in mind that you will need to get your speedometer recalibrated too because your car will travel faster than the speed shown. Larger tires also increase stability and give a smoother ride.

i dont think your right on this one... an engine will work harder to push the bigger tires, hence losing gas efficieny...

ex. if you get your truck lifted, and get bigger tires, your gas efficeny will suck, until you get it regeared...

i might be wrong, but anyways...
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Old 08-01-2004, 01:42 AM #9
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Just treat you're gas pedal like there's an egg under it.
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Old 08-01-2004, 05:42 AM #10
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Fancy knowledge it isn't. A better intake, header, exhaust, cam, forced induction and all that help to increase the Volumetric Effiency of the engine which is how much of the actual capacity the engine has is used. A standard car engine has a VE of around 75-80%. Meaning that a 1.8L car with a VE of 75% only holds roughly 1.35L of charge at one time whether it be intake or exhaust. Increasing this naturally would make more power and more power makes it easier for the engine to move the mass. Really it would depend on what kind of driving you do as to what you would do to the car. If you wanted to make it the most effecient. At lower speeds such as stop and go driving you would want lower end torque. If you do freeway driving you would want it to breath better up top and have greater HP. Making a car for one or the other is pointless unless you have specialized reasons such as a tractor or race car. Really your driving habits have a lot to do with it. Leaning to drive better will do much more than any power adder would for fuel effiency.

As for tires it would once again depend on what you were going for. It's the whole battle with inertia that causes the debate. Larger wheels change the final drive ratio of the drivetrain as do smaller wheels. A larger diameter would decrease acceleration like a shorter gear would but allow you to reach a higher top speed and allow the engine to be at a lower RPM at the same speed. Conversly a smaller diameter would allow for greater acceleration like a taller gear but ultimately hinder the top speed. Also larger rims normally mean more weight which add to the unsprung weight of a vehicle which is for the worse in any aspect of performance. It also give the brakes a harder time because the length of the lever is a lot longer meaning it has to do more work in the same amount of time. Also they've proven that a rim larger than 19" hinders perfomace in all areas as well. Really changing the size wouldn't matter nearly as much as the weight of the rim. Reducing the weight of the rim will help in acceleration and braking no matter what the size. The amount of work it would take to move a diameter of larger circumfrence would null-in-void the better effiency at speed.


Basically you need to learn to drive the car better to get better gas mileage.

How's that for knowledge?
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Old 08-01-2004, 09:41 AM #11
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Cool

Add more air to the mixture in the engine, but that's going to cost quite a bit of change.
Yea, drive the speed limit.
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Old 08-01-2004, 01:18 PM #12
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(doh, I was wrong!)

Thanks F1VENOM, that was the post I was looking for.
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Old 08-01-2004, 01:31 PM #13
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Synthetic Oil.

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Old 08-01-2004, 02:17 PM #14
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yeah, just dont romp on it everytime you start from a complete stop....
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Old 08-01-2004, 03:30 PM #15
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Sell your car and buy a motorcycle.
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Old 08-01-2004, 04:09 PM #16
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Old 08-01-2004, 05:11 PM #17
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Synthetic oil is always a good idea. They replaced the fluids in a Z28 that was stock with Royal Purple (engine oil and tranny fuild) and gained 5whp after. It helps by reducing the friction which is one of the best ways to add power because it slightly increases the thermaldynamic effiency because less power is being lost to generating heat and friction. It really though wont change much as far as fuel economy is concerned.

As for the adding more air or more fuel is hard to one without the other. Getting a SAFCII or a chip to control the air to fuel ratio so you can adjust it closer to the stoichiometric air to fuel ratio of 14.7:1 which is considered nominal. Granted you might not want to run it that lean depending on what you're doing. That would be the most direct way of changing how much fuel is burned at any engine speed. A SAFCII will run you $350 and you have to dyno tune it. That takes about 3-4 hours depending on the car and how lucky you are and at $125 an hour (using the shop by me as a refrence) it can get quite expensive.


Sorry for all the long posts but when you ask how to increase fuel effiency it requires some background.
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Old 08-01-2004, 07:12 PM #18
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your best and easiest way to add/keep good mileage is to keep the cars maintenace up


thats the easiest and best thing you could do
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Old 08-01-2004, 10:25 PM #19
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shift gears at 2500-3k rpm
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