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Yep, me too, only for 19 tanks so far...

http://home.cfl.rr.com/njfiorello/priuslog.xls

A brief description of the columns:
Code:
Columns:
A =Date tank was filled

B =Odometer total miles at time of fill-up
C =Odometer trip  (reset at each fill-up)

D =MFD Outside Temp at time of fill-up
E =MFD Average MPG - (reset at each fill-up)
F =MFD Gas - Calculated (Trip / MPG)

G =Tank - Gas - fuel put into tank
H =Tank - MPG - Calculated (Trip / Gals)

I =Variance - MPG - Calculated (MFD MPG - Tank MPG)
J =Variance - Gas - Calculated (MFD Gas - Tank Gas)
K =Variance - % - Calculated  (VAR MPG / Tank MPG)

L =Pump - Octaine of Gas
M =Pump - Price of Gas
N =Pump - Total Sale

O =Notes - Anything I felt like putting in

Totals Fields:
A1=Esoteric estimate of dollar savings based on 33 MPG Saturn SL2
C1=Total of all trip miles. A cross check for Column B
E1=Mean MFD MPG
H1=Mean Tank MPG
J1=Total Variance - Gas
K1=Total %Variance - 2.7% for those w/o Excel
M1=Mean gas price per gallon
N1=Total gas cost
 

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It's all just wrong!

I had another one of those ideas that my shrink refers to as a paranoid delusion.

Toyota has already sold me the car, so there isn't any tangible gain for them to intentionally skew the MFD estimates towards optimism.

However, the convenience store owner selling me the fuel has something to gain if the pump says 1.00 gallons when it's really spat 0.97 gallons into my tank. His fuel profit margin is increased by 3%

We could be seeing evidence of a world wide conspiracy here.
 

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Re: fuel economy

An04Prius said:
Toyota web site says traditional mpg calculaton (miles driven /gals pumped) is inaccurate for Prius, due to effects of things many of you have already noted...bladder effect, temp on bladder effect, varying pump rates effect on bladder. They say to use the MFD reading.
That's just crazy talk. It's true enough for 1 fill-up, but all those effects will negate each other over time... After 23 tanks, I've installed a total of 5.28 gallons more fuel into my Prius than the MFD says I've used... If the MFD is so accurate, where did all that fuel go?
 

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Hep said:
Maybe somebody siphoned some off after one of your little thunderstorms this summer? :)
Hmmm... I do remember smelling the faint aroma of Jamacan Blue Mountan one morning as I left for work.
 

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Coffee is it's own conspiracy.... How can anything that smells so good taste so foul :)
 
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