Why has my fuel economy gone down the drain?
#1
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Why has my fuel economy gone down the drain?
I have a 1996 SC400 with 131K miles on it and I had a tune up about a month ago or so and I was getting over 300 miles a tank. Now I'm getting just like 130 miles with half the tank gone...
I remember filling the tank up and I got like 250 miles or less maybe... What the hell could have caused this? Before I was getting like 360 with the needle almost touching the end
All I have done throughout the course of these last weeks has been:
1. Add almost an entire can of seafoam to the tank.
2. Refilled the transmission twice. (4 quarts)
3. Oil Change. (Mobil Clean 5000 for now)
4. I added some Restore to the oil. (Cures micro scratches on cylinder walls, for those that don't know of what I'm talking about).
I do notice that the car is moving more slick and pulling harder, but damn... It can't be that much... I drive mostly highway, too...
It seems that with the same throttle pressure as before the car is shifting at higher RPMs... REGARDLESS... I don't speed that much.
EDIT: Is it the fact that it's like 40 degrees in Miami!??! ****!
I remember filling the tank up and I got like 250 miles or less maybe... What the hell could have caused this? Before I was getting like 360 with the needle almost touching the end
All I have done throughout the course of these last weeks has been:
1. Add almost an entire can of seafoam to the tank.
2. Refilled the transmission twice. (4 quarts)
3. Oil Change. (Mobil Clean 5000 for now)
4. I added some Restore to the oil. (Cures micro scratches on cylinder walls, for those that don't know of what I'm talking about).
I do notice that the car is moving more slick and pulling harder, but damn... It can't be that much... I drive mostly highway, too...
It seems that with the same throttle pressure as before the car is shifting at higher RPMs... REGARDLESS... I don't speed that much.
EDIT: Is it the fact that it's like 40 degrees in Miami!??! ****!
Last edited by MarcusMIA; 01-06-10 at 08:23 PM.
#6
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Thread Starter
I heard you should change the spark plugs if you put the seafoam through a vacuum hose. I put it in the gas tank. When I did it through a vacuum hose I got a tune up right away.
Why is it that winter gas = bad mpg?
Why is it that winter gas = bad mpg?
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metalninja
ES - 1st to 4th Gen (1990-2006)
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01-09-12 06:45 PM