My current car is supposed to get better mileage with premium. I've
checked my mileage for 10k miles. Most of this was with regular octane
but I did put in high octane for about 7 tankfulls and I could not prove
from my statistics that I got better mileage with premium. I did expect
it to be a little better, maybe not equal to the increase in cost.
Granted it is not possible the way I drive to do a real scientific long
term test, so I'm not drawing any conclusions based on my own experience.
>> But the cost difference between $2.69 a gallon, and $3.00 a gallon
>> (current gas prices by me,) if you drive 16k miles in a year
>> and you get
>> 25 MPG, then it will only cost you $198.4 dollars A YEAR more for the
>> premium.
>>
>
> Unless of course, using premium means you actually use less fuel for the
> same distance. Pretty much all modern cars use a knock sensor to measure
> fuel octane, and advance the spark accordingly. More octane means more
> advance which usually means better fuel mileage.
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