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.