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Old 10-15-2006, 21:24   #1 (permalink)
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Which grade of Gasoline provides the best fuel economy?

Obviously driving sensibly helps the most, but i feel that i just can't drive more sensibly. I have it dialed in. I always maintain momentum, drive 55 on the highways, and anticipate red lights. My car is always kept up on maintenance. I also have a k&n.

Now on to the gasoline.-since i got the car on june 29th, i've gas'd up 3 times. Each time at shell, each time filling it up with premium.

(1989 Ford Probe LX 2.2l Automatic)

Right now, the fuel mpg light indicator shows 7.7 Liters/100km, which on one site converted to a little over 30mpg.

The way i drive, i think it's possible.

But my question is, how heavily does fuel grade influence fuel economy? I have no problem paying extra for the 91 octane shell vpower. Especially if it's better for my car.

Here in Nebraska, there a 3 main grades, Plus (87) Regular (89)
and Premium (91)

Obviously i want the grade that's best for my car, and one that helps the fuel economy.

I am a little wary of the 89 grade because it has 10% ethanol.

Any help guys? THanks.
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Old 10-16-2006, 23:49   #2 (permalink)
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Re: Which grade of Gasoline provides the best fuel economy?

I like the 10% Ethanol - seems to make the Fairlane run cooler, more power, less pinging and better fuel economy...

Ethanol is an excellent Octane Booster and at a 10% concentration, unlikely to cause any damage to a modern car.
In fact, since Ethanol is very hygroscopic, it will absorb the moisture from your fuel tank and help prevent rust in there.
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Old 10-17-2006, 11:17   #3 (permalink)
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Re: Which grade of Gasoline provides the best fuel economy?

the best grade for your car if your car is stock or close to stock is the one recommended by your owner's manual
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Old 10-17-2006, 11:30   #4 (permalink)
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Re: Which grade of Gasoline provides the best fuel economy?

i'll have to take a look in there. Yeah, in the winter time, i guess ethanol wouldn't be a bad idea because it will keep shit from freezing. Right now, i'm maintaining a steady 7.7L/100km (my 1989 Probe has an electronic indicator) so that's slightly over 30mpg according to conversion sites.

I will say, the probe has some incredible technology for being an 89.
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