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How to compute mileage (mpg)?



 
 
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  #11  
Old June 25th 05, 10:05 PM
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You are just kidding this guy right?

mike hunt


Mark A wrote:
>
> Newbie" > wrote in message
> ...
> > It may seem like a superfluous question, but what is the best way of
> > calculating what mmg yuor vehicle is getting? I have my miles reading
> > of course, and I can record how much gas I put in, but there was some
> > gas already there in the tank, and how do I know what was traveled on
> > how much gas? If you have a good system, please share!

>
> You have to do it over a long period of time (many tank fulls) and then
> estimate the beginning fuel level the very first time. Any error in
> estimating the beginning fuel level the first time will be minimized when
> looking at 10 or more tanks of gas to calculate the mileage.

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  #12  
Old June 25th 05, 10:07 PM
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Do you expect him to drive backward? LOL


mike hunt



Randy wrote:
>
>
> Fill the tank and record the mileage.
>
> The next time you need gas, fill the tank and record the mileage.
> Subtract the second mileage from the first mileage. Divide the result by
> the amount of gas (gallons and tenths) purchased the second time.

  #13  
Old June 25th 05, 10:10 PM
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What if he is traveling cross country?


mike hunt



Kathy and Erich Coiner wrote:
>
> 1. Fill Tank.
> 2. Record mileage.
> 3. Drive car till near empty.
> 4. Fill tank again. Use same pump at same station. Let the auto shutoff
> system work. (Do this on initial fillup too. Record gallons to fill
> 5. Record mileage.
> 6 mpg= (mileage step 5-mileage step 2)/gallons used step 4.
>
> Erich
>
> "Mark A" > wrote in message
> ...
> > Newbie" > wrote in message
> > ...
> > > It may seem like a superfluous question, but what is the best way of
> > > calculating what mmg yuor vehicle is getting? I have my miles reading
> > > of course, and I can record how much gas I put in, but there was some
> > > gas already there in the tank, and how do I know what was traveled on
> > > how much gas? If you have a good system, please share!

> >
> > You have to do it over a long period of time (many tank fulls) and then
> > estimate the beginning fuel level the very first time. Any error in
> > estimating the beginning fuel level the first time will be minimized when
> > looking at 10 or more tanks of gas to calculate the mileage.
> >
> >

  #14  
Old June 25th 05, 10:15 PM
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Sad isn't it. It is like asking a person for directions and he
tells you to go south past my dads house then turn right. If
you get to my brothers house your are three blocks past it. LOL


mike hunt



No Spam wrote:
>
>
> Amazing. Our educational system on display.

  #16  
Old June 25th 05, 11:17 PM
Ray O
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"Daniel J. Stern" > wrote in message
n.umich.edu...
> On Sat, 25 Jun 2005, Newbie wrote:
>
>> It may seem like a superfluous question, but what is the best way of
>> calculating what mmg yuor vehicle is getting? I have my miles reading of
>> course, and I can record how much gas I put in, but there was some gas
>> already there in the tank, and how do I know what was traveled on how
>> much gas? If you have a good system, please share!

>
> It's very simple.
>
> Fill your tank at a given station to a given point (say, the second time
> the nozzle clicks off). Reset your trip odometer or note the mileage
> reading.
>
> Drive the car. The longer you drive it, the more accurate will be your
> mileage calculation.
>
> Return to the same gas station -- use the same pump if possible. Fill the
> tank once again to the same point as before (say, the second time the
> nozzle clicks off). Note the number of litres or gallons, and the odometer
> reading.
>
> Divide the number of miles you travelled by the number of gallons you
> purchased. That is your fuel mileage (in miles per gallon) for that tank
> of fuel.
>
> OR
>
> Multiply the number of litres you bought by 100, then divide the
> result by the number of kilometres you travelled. That is your fuel
> mileage (in litres/100km) for that tank of fuel.
>


It is not necessary to return to the same gas station and the same pump to
calculate fuel mileage. Most fuel pumps are regulated by the local
government's bureau of weights and measures so my guess is that the amount
of fuel recorded as delivered to the tank should be close enough for fuel
economy calculation purposes.

Monitoring fuel mileage is more useful to see a trend, not so much
individual tanks. You will find over time, with the same driver in the same
road conditions, fuel mileage is going to be fairly consistent, within 2 or
3 mpg. If you see a gradually decreasing trend, take the car in for a
checkup.
--
Ray O
correct the return address punctuation to reply


  #17  
Old June 26th 05, 02:02 AM
Rich Lockyer
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On Sat, 25 Jun 2005 17:33:40 GMT, Newbie > wrote:

>It may seem like a superfluous question, but what is the best way of
>calculating what mmg yuor vehicle is getting? I have my miles reading
>of course, and I can record how much gas I put in, but there was some
>gas already there in the tank, and how do I know what was traveled on
>how much gas? If you have a good system, please share!


Fill tank, reset trip odometer or record actual mileage.

Drive.

Refill tank. For most accurate results, use the same pump parked in
the same position. If you routinely "top off" then do so by the same
number of "clicks".

Record number of gallons.

Read trip mileage, or record actual mileage.

Subtract old mileage reading from new mileage reading... should match
trip mileage.

Miles per gallon equals miles/gallons... miles divided by gallons, or,
for example, you went 340 miles on 19 gallons, then your MPG is
340/19 or 17.9mpg

http://personal.linkline.com/rlockyer/TundraGas.xls


--- Rich
http://richlockyer.tripod.com/
  #18  
Old June 26th 05, 02:28 AM
Ad absurdum per aspera
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To the good advice given elsewhere in the thread, I would add, "check
your speedometer" (and thus your odometer). These things have some
intrinsic error, which might either stack up atop or the other
potential source of error: hanges you have made by tire/wheel size.


Knowing how much and in which direction your speedometer is fibbing can
save you from tickets, too!

A few runs past one of those radar "sleds" at a steady and easily
readable speed should suffice, although finding a stopwatch, or a
wris****ch with a sweep second hand, and timing yourself through a
measured mile or a "speedometer test section" on the freeway is the
classic way of doing it.


You can easily see how recordkeeping can combine with the aspects of
fillup discipline mentioned by others to let you partial out highway
from city from all-around mileage.



If all you want is a good horseback guess, the fillup practices are
probably the most important aspect, unless your speedometer is way off.


Also, the study should be conducted over a span of time longer than a
couple of tankfuls but shorter than a season (differences in driving
habits as the weather changes, and in some areas differences in
gasoline formulation, can affect mileage).
Cheers,
--Joe

  #19  
Old June 26th 05, 05:30 AM
Kiran
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> wrote:

: Sad isn't it. It is like asking a person for directions and he
: tells you to go south past my dads house then turn right. If
: you get to my brothers house your are three blocks past it. LOL
: >
: > Amazing. Our educational system on display.

I don't think OP needs help with division or what to divide into what.
I interpreted his question as: how to estimate the # of gallons
consumed over a measured distance? I myself wonder just how accurate
the auto shut-off mechanism is for this purpose. But it gives an
estimate.

In the end, I care not so much about the most accurate mpg number (I
mean, what am I going to do, not buy groceries or drive to see my
family if mpg is x instead of y?), but about getting a warning if it is
consistently worse than usual.
  #20  
Old June 26th 05, 05:30 AM
DTJ
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On Sat, 25 Jun 2005 12:33:33 -0600, "Mark A" >
wrote:

>Newbie" > wrote in message
...
>> It may seem like a superfluous question, but what is the best way of
>> calculating what mmg yuor vehicle is getting? I have my miles reading
>> of course, and I can record how much gas I put in, but there was some
>> gas already there in the tank, and how do I know what was traveled on
>> how much gas? If you have a good system, please share!

>
>You have to do it over a long period of time (many tank fulls) and then
>estimate the beginning fuel level the very first time. Any error in
>estimating the beginning fuel level the first time will be minimized when
>looking at 10 or more tanks of gas to calculate the mileage.


Uh huh.

Or, you could simply fill the tank, then reset your mileage counter,
then when you fill it next time you do a little thing called division.

If you wish, you can do this multiple times. You could even write it
down. You could then decide to average the average, or do running
averages.

Life is so simple with a little basic math.
 




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