Originally Posted By: KeithS_NW_Ohio
Track your fuel cost using this spreadsheet. Do 3 or 4 fill ups with 87 and then 3 to 4 fill ups with 91-93 octane. The spreadsheet will show you your cost per mile on different fuels.
http://www.vertex42.com/ExcelTemplates/mileage-calculator.html
The only problem with that is it ignores weather impact. Weather has a very noticeable impact on MPGs.
Track your fuel cost using this spreadsheet. Do 3 or 4 fill ups with 87 and then 3 to 4 fill ups with 91-93 octane. The spreadsheet will show you your cost per mile on different fuels.
http://www.vertex42.com/ExcelTemplates/mileage-calculator.html
The only problem with that is it ignores weather impact. Weather has a very noticeable impact on MPGs.