Am I imagining this?

[FORDF250HDXLT]

I'm trying to get a grip on the thought process here.
Are you using the amount pumped in each fuel ticket as the basis?

When I'm riding the bike I use the range on a full tank ,because I don't have a gas gauge !which is pretty critical knowing how far I can get on the bike without running out of gas in the middle of nowhere so I fuel it the same way each time makes it easier to calculate .It would be interesting to see if there's an alternate method for the truck due to foaming and air purging.

it's very simple.
if your fill ups are consecutive,the only discrepancy can be your first and final fill up because all the fill ups in between will be corrected by the next.

example;
you first fill up a 10 gallon tank with 10 gallons and reset your odo.

you drive 100 miles and you write down your mileage.

you fill up with 10 gallons again and notice you just got 10 mpg.reset the odo.

you drive 100 miles and you write down your mileage.

you fill up again,this time with 8 gallons (for some reason you used a big rig nozzle and it foamed bad or whatever.didn't actually fill anyway) and reset your odo.you look and think you just got 12.5 mpg and reset your odo.

you drive 60 miles this time because you notice your nearing E sooner.when you fill up it takes 7.5 gallons here and you see it looks like you just got 7.5 mpg here.however all it did was correct the last tanks fill up error.


notice in either of the last cases you know your truck didn't get 12.5 mpg nor 7.5 mpg but if you average them out,they corrected the true average for 10 mpg see?

these variances can be any amount.any fill up error possible.so long as you do two things:
1.record the mileage correctly each time and
2.fill up consecutively.


no matter what fill up errors you get in between your first and final tank,the end result will be a 100% true average.

the more consecutive fill ups you calculate,the more variances in road conditions,ambient temps,driving style,city traffic,etc.etc.etc.
a single tank or two means very,very,very little.all you care about is the average.this will be what your trucks mpg is and with calculating consecutively you don't have a care or worry in the world how much fuel actually goes into each fill up because it just wont matter.
and to add to this just a touch more,if you get 40-50 consecutive tanks or so,your pretty much going to bury the small discrepancy of your first and final fill up too,so that even those tanks might only change the overall average by .0253 or something.

 

[riotwarrior]

^^^^ logic is flawed ^^^^^ unless you FILL the tank.

I just refueled and from when pump kicked off to a full filler neck I added about 2 IMP gallons

It aint FULL unless it is FULL

Kick off happens for a variety of reasons thus at different fill levels so you can never fully determine if your tank is full thus how many gal used fkr given distance.

This is justnmeblabbingcauseIwannaanddissagreewiththeflawedlogic

 

[riotwarrior]

To me its like baking a cake a d if it requjres 1 cup of flour and well for some reason you hqve a 3/4 cup measuring cup today you just use3/4 cup flour ...then tomorrows cake you founf the 1 1/4 cup measuring cup but lost the 3/4 so you add 1 1/4 cup today...neither cake is right...meanwile wife is laughing cause shes hid the 1 cup..so sh can be .seeing how your averages work out all the while at flawed.logic

 

[FarmerFrank]

To me its like baking a cake a d if it requjres 1 cup of flour and well for some reason you hqve a 3/4 cup measuring cup today you just use3/4 cup flour ...then tomorrows cake you founf the 1 1/4 cup measuring cup but lost the 3/4 so you add 1 1/4 cup today...neither cake is right...meanwile wife is laughing cause shes hid the 1 cup..so sh can be .seeing how your averages work out all the while at flawed.logic

I don't mean to jump into the middle of anything, but here we go.

....... you still have 2 edible cakes and you are now 2 cups of flour shy of a full bag..... Sounds like the same end result.


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[Clb]

Excluding the first tank and or assuming you can verify the 10 gal fill..this sounds good.
A phuwking ( sound it out phonetically) graduated cyl. Fuel cell on a closed loop system is going to cure any back and forth!
I am interested in and only care about 1/2 us gallon results, I do miss the days when uncle sam had fuel anywhere I was at( driver) ...Anyhow thanks for the differing perspectives!
Its allways good to see other methods of doing something.
If mileage and gallonage are strictly monitored' not full filler neck...someone have the capability of dispelling this methods accuracy???

 

[Clb]

I don't mean to jump into the middle of anything, but here we go.

....... you still have 2 edible cakes and you are now 2 cups of flour shy of a full bag..... Sounds like the same end result.


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[ironworker40]

IF your speedometer is accurate.

What method do you use for checking this? Mile markers on the highway are close but not perfect. Gps is also close. But you are correct most of these speeds are not that accurate.
.

 

[BrianX128]

If it makes anyone feel any better I got 20.2 mpg in both tanks today so the actual problem turns out to be I'm an idiot, it would appear haha..

 

[Shadetreemechanic]

it's very simple.
if your fill ups are consecutive,the only discrepancy can be your first and final fill up because all the fill ups in between will be corrected by the next.

example;
you first fill up a 10 gallon tank with 10 gallons and reset your odo.

you drive 100 miles and you write down your mileage.

you fill up with 10 gallons again and notice you just got 10 mpg.reset the odo.

you drive 100 miles and you write down your mileage.

you fill up again,this time with 8 gallons (for some reason you used a big rig nozzle and it foamed bad or whatever.didn't actually fill anyway) and reset your odo.you look and think you just got 12.5 mpg and reset your odo.

you drive 60 miles this time because you notice your nearing E sooner.when you fill up it takes 7.5 gallons here and you see it looks like you just got 7.5 mpg here.however all it did was correct the last tanks fill up error.


notice in either of the last cases you know your truck didn't get 12.5 mpg nor 7.5 mpg but if you average them out,they corrected the true average for 10 mpg see?

these variances can be any amount.any fill up error possible.so long as you do two things:
1.record the mileage correctly each time and
2.fill up consecutively.


no matter what fill up errors you get in between your first and final tank,the end result will be a 100% true average.

the more consecutive fill ups you calculate,the more variances in road conditions,ambient temps,driving style,city traffic,etc.etc.etc.
a single tank or two means very,very,very little.all you care about is the average.this will be what your trucks mpg is and with calculating consecutively you don't have a care or worry in the world how much fuel actually goes into each fill up because it just wont matter.
and to add to this just a touch more,if you get 40-50 consecutive tanks or so,your pretty much going to bury the small discrepancy of your first and final fill up too,so that even those tanks might only change the overall average by .0253 or something.

Great explanation. Just finished a 2264 mile Christmas road trip using 89.4 gallons. Those 89.4 gallons went in over several fillups. Some times the tank filled, others it did not. Made my tank mpgs vary between 24 and 27 mpg, but average it all out and I got 25.3 over the whole trip. Wouldnt' of mattered if I filled the tank half way 16 times or filled it all the way 8 times.

 

[Clb]

S T M...
I don't see a cummins in your sig line, who do I have to *^• to get an idi to pull them nunbers???
Whatcha take on the trip?

 

[Shadetreemechanic]

S T M...
I don't see a cummins in your sig line, who do I have to *^• to get an idi to pull them nunbers???
Whatcha take on the trip?

Sorry, meant to include that.
85 mercedes 300TD with a 3.0 inline 5 cylinder turbo.....It is an IDI technically speaking.

 

[Clb]

Yea I was a dreaming of 25 from a binder!

 

[FORDF250HDXLT]

Great explanation. Just finished a 2264 mile Christmas road trip using 89.4 gallons. Those 89.4 gallons went in over several fillups. Some times the tank filled, others it did not. Made my tank mpgs vary between 24 and 27 mpg, but average it all out and I got 25.3 over the whole trip. Wouldnt' of mattered if I filled the tank half way 16 times or filled it all the way 8 times.

thank you.exactly! you get it.

 

[FORDF250HDXLT]

To me its like baking a cake a d if it requjres 1 cup of flour and well for some reason you hqve a 3/4 cup measuring cup today you just use3/4 cup flour ...then tomorrows cake you founf the 1 1/4 cup measuring cup but lost the 3/4 so you add 1 1/4 cup today...neither cake is right...meanwile wife is laughing cause shes hid the 1 cup..so sh can be .seeing how your averages work out all the while at flawed.logic

you might have a couple funny tasting cakes but you used 2 cups of flour.same measurement in the end.

the difference here is,that diesel fuel will taste just the same to that idi.

If mileage and gallonage are strictly monitored' not full filler neck...someone have the capability of dispelling this methods accuracy???

no one can.

https://www.youtube.com/watch?v=PaSqH8lhB0M

 

[79jasper]

I got terrible mileage coming back from ok. Only averaged about 32 mpg....

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