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Mik · 05-17-2008, 01:02 PM

The price difference between 87 octane and 91 octane gas here in Minnesota is $0.12 per gallon (always has been).

If you do the math, you'll find that the price per mile is cheaper if your car gets just 1 mpg better with the premium when the prices are over $3.50.

When gas was $1.50 per gallon range, it took a difference of over 3 mpg between the two octane grades to make it worth while to buy the more expensive gasolines.

GAS @ $3.50+ per gallon:
MPG Cost/ Cent/ Cost/ Cents/
Gallon Mile Gallon Mile
26 3.65 14.04 3.71 14.27
27 3.65 13.52 3.71 13.74
28 3.65 13.04 3.71 13.25
29 3.65 12.59 3.71 12.79

GAS @ 1.50+ per gallon
26 1.50 5.77 1.62 6.23
27 1.50 5.56 1.62 6.00
28 1.50 5.36 1.62 5.79
29 1.50 5.17 1.62 5.59

(Sorry, but I can't seem to get the above table to print out right in this format, but I generated the numbers in Excel.

05-17-2008, 01:02 PM	#1 (permalink)
Mik Junior Member Join Date: May 2007 Posts: 20	Gas Savings, Do the Math... The price difference between 87 octane and 91 octane gas here in Minnesota is $0.12 per gallon (always has been). If you do the math, you'll find that the price per mile is cheaper if your car gets just 1 mpg better with the premium when the prices are over $3.50. When gas was $1.50 per gallon range, it took a difference of over 3 mpg between the two octane grades to make it worth while to buy the more expensive gasolines. GAS @ $3.50+ per gallon: MPG Cost/ Cent/ Cost/ Cents/ Gallon Mile Gallon Mile 26 3.65 14.04 3.71 14.27 27 3.65 13.52 3.71 13.74 28 3.65 13.04 3.71 13.25 29 3.65 12.59 3.71 12.79 GAS @ 1.50+ per gallon 26 1.50 5.77 1.62 6.23 27 1.50 5.56 1.62 6.00 28 1.50 5.36 1.62 5.79 29 1.50 5.17 1.62 5.59 (Sorry, but I can't seem to get the above table to print out right in this format, but I generated the numbers in Excel.