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Old 05-23-2010, 11:51 AM   #1 (permalink)
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Default Highway Speed

Hello My Name is Mr Olson i have a 1993 Geo Tacker Lsi hardtop 1.6 auto matic that my daughter drivers i would like to see what the easiest way would be to get this car to run at highway speed's at a lower RPM rite now at 60 the engine i s running at 3500 rpm
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Old 05-23-2010, 01:59 PM   #2 (permalink)
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Ah, Mr. Olson, an unusual parental request..... Do you not think that 60 is fast enough for your daughter to drive? Of course, your daughter can drive the car faster - after all, the car is capable of running at 4500 rpms or more, which would get her up to about 75 or so. That being said, regrettably this is pretty much the gear ratio of the car. And in driving over 3000 rpms, you will notice a decrease in the efficiency of the gas mileage, as well. If, as a parent, you wish for your daughter to be careening down the highway at 75 or more, then she would probably need to get another car that is designed to cruise at those kinds of speeds.
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Old 05-23-2010, 07:23 PM   #3 (permalink)
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Thank you Bex but the speed is not what i'm worried about it's the fuel milage of this Geo i would like to improve apon.That is the only reason i was asking about the speed
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Old 05-23-2010, 08:09 PM   #4 (permalink)
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Default MPG and Trackers

according to this link -1990-1998 Geo/Chevrolet Tracker: Road Test - Consumer Guide Automotive, Trackers and Sidekicks average from 24 to28 MPG.

What mileage are you getting?

You would probably have better luck give your Tracker a good going-over and a tune-up. That would be cheaper than trying to stick differentials out of a 5-speed (5.125 ratio) in it.

If you are concerned about 3000 RPMs at 60 MPH being high, you must realize that Suzuki engines - like many Japanese vehicle engines - put out most of their power/torque at higher RPMs than "American Iron". My Samurai's 1.6 8-valve Tracker engine does it's best at 3,200 to 4000 RPMs.

At 4000 RPMs with 30 inch tires and 4.525 Tracker ring and pinions I get 68 MPH and average 21 MPG. This may not be incredible mileage, but I believe it beats a Jeep. I could get more if I didn't drive so aggressively and I switched from a Weber to a Harley Carburetor.

Tune-up! Much cheaper!

I hope that this helps!
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Old 05-24-2010, 06:41 AM   #5 (permalink)
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OK, I feel better now. Regarding fuel mileage, the car engine works at the greatest efficiency between 2000 and 3000 rpms, so for the best gas mileage, you should keep the tach between these rpms. A proper tuneup ,etc., is essential, as well. You daughter's car is a 1993, and you don't advise whether you ever changed the o2 sensor. When this sensor begins to fail (usually at about 100,000 miles) it fails lean, meaning that it will cause the car to run rich. So changing this will also increase your gas mileage by a few miles per gallon. The car should normally idle, when warmed up, at about 800 rpms. You should make sure that there are no vacuum leaks, etc, which would cause the car to idle higher and use more gas, too. But, aside from the tune-up, and o2 filter, the best way to reduce mpg is to drive the car within the range that it was intended.
In my car, I get about 25 mpg city and 29+ mpg highway. That is pretty much the best these cars can do.
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Old 05-24-2010, 07:23 AM   #6 (permalink)
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I just took mine camping this weekend, with a lot of interstate driving. Going 70 mph I was hitting about 3800 rpm, with 215/75/15 tires. Mileage was about 27 mpg. From my experience, you get the best mileage with these engines between 3200-3800 rpm.

The '91 2WD I used to have got 32 mpg when I commuted 50 miles on interstate each way...
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Old 05-24-2010, 07:30 AM   #7 (permalink)
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Ah, I would have to disagree with that. Frankly, I think the car is actually running at its best at about 2500 rpm, not straining, doing about 45mph. I've squeaked over 30mpg highway doing that. Although I must say its pretty frustrating driving at that speed. I think that you begin to lose mpg once you get over 3000+, and certainly at 3800 rpms. IMHO.
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Old 05-24-2010, 07:35 AM   #8 (permalink)
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I still say that with an automatic no Tracker is going to get in the high 20's. 25 mpg is pretty darn good for an automatic.
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Old 05-24-2010, 07:38 AM   #9 (permalink)
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Buying an auto Tracker disqualifies you from worrying about mileage.

The truth hurts, live with it.

Or, lower the suspension, fit a manual g'box and then fit a modern engine
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Old 05-24-2010, 07:54 AM   #10 (permalink)
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Quote:
Originally Posted by SlimJim16v View Post
Buying an auto Tracker disqualifies you from worrying about mileage.

The truth hurts, live with it.
Not really, 23 mpg is still a lot better than the 18 or less a Jeep would have.
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