ChrisS
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| posted on 21/5/08 at 12:55 PM |
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Petrol Price Oddity
Just filled the locost up and during lunch thought id put together a spreadsheet to calculate MPG MPL etc etc.
Found something a bit strange, and unless my calculations are wrong, im not sure who gains from this.
I just brought £22.23 of petrol at £1.159 per litre, which by my calcs should mean i got 19.18 litres of petrol, yet the pump told me that it had
delivered 19.69 litres.
Anyone interested might find this Excel sheet handy. Its protected to prevent deleting the formulas, but but the password is set to blank if you
really want to change it.
Link to spreadsheet
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Mr Whippy
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| posted on 21/5/08 at 01:00 PM |
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perhaps the pump needs recalibrated
Fame is when your old car is plastered all over the internet
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Paul TigerB6
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| posted on 21/5/08 at 01:03 PM |
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you sure the petrol wasnt £1.12.9 as thats what you paid!!
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matt_claydon
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| posted on 21/5/08 at 01:08 PM |
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The only thing I can think is that the price on the pump was not the same as the price displayed on the big sign.
Your receipt should show the price you actually paid per litre and if this multiplied by the number of litres does not equal the total price paid then
I simply cannot understand how that could happen.
Conversion from litres pumped to price paid is a simple multiplication, nothing to do with flow measurement in the pump.
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blakep82
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| posted on 21/5/08 at 01:13 PM |
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^ but wouldn't the litres pumped be worked out from the flow rate of the pump?
hmmm, i don't know... you got more that you were supposed to, so whats the problem?! lol
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ChrisS
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| posted on 21/5/08 at 01:20 PM |
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quote:
Originally posted by matt_claydon
The only thing I can think is that the price on the pump was not the same as the price displayed on the big sign.
Your receipt should show the price you actually paid per litre and if this multiplied by the number of litres does not equal the total price paid then
I simply cannot understand how that could happen.
Conversion from litres pumped to price paid is a simple multiplication, nothing to do with flow measurement in the pump.
Strange, my receipt only shows the total cost which was £22.23. Ill check back later when i pass the pump on the price, but im sure it was 115.9
I also use this website which tells you the best prices in your area.
PetrolPrices.com
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Paul TigerB6
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| posted on 21/5/08 at 01:20 PM |
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quote:
Originally posted by blakep82
^ but wouldn't the litres pumped be worked out from the flow rate of the pump?
Yes - but the total price displayed is then taken from the volume of fuel pumped and its the price per litre the garage can change themselves. They
cant mess about with the calibration of the volume of fuel dispensed (weights and measures standards etc).
Its going to be either the fuel was charged at 112.9p / ltr and displayed as 115.9, or its a simple misread of the price
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matt_claydon
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| posted on 21/5/08 at 01:23 PM |
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quote:
Originally posted by Paul TigerB6
Yes - but the total price displayed is then taken from the volume of fuel pumped and its the price per litre the garage can change themselves. They
cant mess about with the calibration of the volume of fuel dispensed (weights and measures standards etc).
Its going to be either the fuel was charged at 112.9p / ltr and displayed as 115.9, or its a simple misread of the price
Yep, that's what I was trying to say 
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dhutch
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| posted on 21/5/08 at 01:54 PM |
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I still wouldnt grumble. Petrol here is 116.9! As of monday, it was 110.9 friday afternoon.
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Hammerhead
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| posted on 21/5/08 at 01:58 PM |
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why has it suddenly shot up? diesel was 122 last week now is 129. WTF!
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Kriss
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| posted on 21/5/08 at 02:07 PM |
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and what MPG have you got dude?
You hav eno control over costs, but do with your right foot!
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ChrisS
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| posted on 21/5/08 at 02:18 PM |
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Well the car is only a month old so the right foot novalty is still there, and im not really doing any sort of distances, just short blasts round the
block, or 1-2 junctions on the dual carriageway to do some testing, and by my calcs im getting 28-29 to the gallon, which i guess isnt too bad at
all.
what due think?
Check out the spredsheet to do your own. Link is in the first post.
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Kriss
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| posted on 21/5/08 at 02:23 PM |
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i wouldnt have a clue about R1 fuel economy. Might be able to tell you in 2 weeks if it passes its SVA.
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