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Old 10-05-2008, 07:12 PM   #1
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Default Optimum rpm level for most economical fuel usage.

What rpm level, per specific gear, will give me the best fuel economy?

I'm guessing I will get alot of guesses as to the optimum level but does anyone have any emperical data from one of those mpg readers you can hook up to your car?

I have a D16z6, basically stock.

Tires are 205-50-15 so not much difference from stock.
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Old 10-05-2008, 09:13 PM   #2
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Default Re: Optimum rpm level for most economical fuel usage. (Dann6968)

lower the rpm > the less time the injector is open > less fuel is sent thru injector > more gas to burn later Click the image to open in full size.


Modified by davken1102 at 12:21 AM 10/6/2008
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Old 10-05-2008, 11:32 PM   #3
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Default Re: Optimum rpm level for most economical fuel usage. (davken1102)

Quote:
Originally Posted by davken1102
lower the rpm > the less time the injector is open > less fuel is sent thru injector > more gas to burn later Click the image to open in full size.


Modified by davken1102 at 12:21 AM 10/6/2008
i think theres more to it then that... it seems like your throttle position would play a large roll as well as engine load.
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Old 10-05-2008, 11:52 PM   #4
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The less you open your throttle the less fuel will be used. Shifting RPM is up to you and how your car feels on the road during the moment. The road is always changing so we cannot help you there. But you can try accelerating slowly, step down on the throttle pedal as least as possible, give it just enough throttle to gain speed. Don't try to accelerate fast. Shifting is up to you at this point, if you want to really milk the living daylights out of your motor you can try shifting below 3000 RPM. Using this technique it will probably take you a long time to reach to 50MPH. Beware, other cars might be upset with you. You will take off very slow, but once up to speed, and gear, always keep in mind that the less throttle you give it the less gas will be used.

Throttle just enough, give it what it needs, no more no less. Click the image to open in full size. Have fun.
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Old 10-06-2008, 12:00 AM   #5
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I re-read your post. Here is a few more tips if you want to know. Your tires are not the same size as the orignal. So if you ever try to compare your car to others to see who gets more miles to a gal. You must calculate the difference your tire is making compare to the original size. You can google tire calculator and there are many sites that will help you find the answer.

My method of calculating my fuel is filling the gas tank until the handle clicks. Reset trip meter. Drive as normal. When you re-fill again (does not need to be empty) keep filling up until it clicks. Now take the number on your trip meter and divide it with how many gallons you JUST pump. This should give you your Miles Per Gallon.

Again, since your tires are off and does not match with original size you can't see if yours or your buddy's car gets better gas millage. You can compare to yourself each time to see how you been driving to see if you have improve or not. But you can't compare to others until you re-calculate your tires using the tire calculator.

I have a 94 Civic CX with D16Z6. I am getting average of 39 miles to a gallon. I am using the technique I showed you above. I am in the U.S. so we use GAL. convert to which ever your country uses.
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Old 10-06-2008, 01:45 PM   #6
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Default Re: (lv6l)

Thanks fo the info but that isn't exactly what I am looking for.

What got me thinking about this was my Dad's boat. He will use 50% more gas cruising at 2700rpm rather than 2500rpm.

What I am wondering is (eg.) the mileage difference in reving 2500rpm in 5th or reving 2700rpm in 5th.

Driving with lower revs does not equate better gas milage. Driving in 4th at 1000rpm will not save you gas.
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Old 10-06-2008, 01:47 PM   #7
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Also, 205-50-15 is very close to the stock 185-60-14. Within 1.5%.


http://www.miata.net/garage/tirecalc.html
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Old 10-06-2008, 03:01 PM   #8
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Default Re: (Dann6968)

Quote:
Originally Posted by Dann6968
Also, 205-50-15 is very close to the stock 185-60-14. Within 1.5%.
Tire size is arguable. I had the stock 195's on the car and changed to 205/60/15's, and I get about 2 mpg less now with the bigger tires. Bigger tires=more weight. More weight= more gas to turn.

As to the original question, keep your foot out of its *** as much as possible, and you wont see the gas gauge go down as fast. There are WAY too many variables to give you a hard and fast rule for your question.
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