Winter Gas Causing Drop in MPG?

[b_hickman11]

Originally Posted by docB

It is great to track mileage. The big thing that really tells the whole picture is to keep track of all the fuel that goes into the tank and divide that into the mileage on the odometer. Then the amount you got back into the thing on a refill is a moot point. I made a small excell spread sheet. I keep track of the date, the odometer reading, the quantity of fuel (all the decimal places on the pump), the dollar amount and where I got it. If there are odd circumstances, I keep a side note. I track maintenance items here, too. The sum of the cost of the fuel is tracked along with the total gallons used. This is the number that I divide into the total miles on the car. I update the total fuel economy at the government EPA your mileage site. I have been over 39 mpg since I picked up my cash for clunker the last day of August last year. The max was a little over 44mpg and the low is probably in the high 20s. By the way, a 1994 Ford Escort Wagon 5-speed I bought new average just over 35 mpg over the time I owned it. I don't place a lot of faith in the instantaneous readings the cars provide. I think by brothers full size Dodge pick-up could only get 99mpg on a railroad flat car...lol
doc

Sounds like a lot of extra work just to find your mpg.....