Buying Petrol

Phoenix

Free Member
Aug 24, 2007
70
2
East Anglia
Funster No
163
MH
RV
Exp
20
An extract from Phoenix Travel Club (USA) 2008 newsletter.

"Only buy or fill up your car, RV or
whatever in the early morning when the ground
temperature is at its coolest. Since service stations have
their storage tanks buried below ground, the colder the
ground, the denser the gasoline. When it gets warmer the
gasoline expands, so in the afternoon, or when it warms
up, your gallon is not exactly a full gallon. A 1-degree
change in temperature is a big deal."

Would it save a few bob?:thumb:eek:r not:thumbdown:
Chris


Chris
 

oldun

Free Member
Mar 23, 2008
748
158
St Neots
Funster No
1,917
MH
VW Campervan
Exp
Since 2001
As an (ex) engineer, in the good old days, we used to bury our temperature reference probes about 6 ft underground on the understanding that the temperature there varied little from season to season.

I cannot believe that there is a significant change in the temperature of the stored fuel throughout the day.

Also the coefficient of expansion of a liquid is minute so the extra mass acquired for a few degrees of temperature fall would also be minute.

Now with gases things are different
 

ocsid

Free Member
Dec 20, 2008
54
0
Funster No
5,197
Lets put it this way as most of us drive diesels:
If you take on 70 litres and you get 25 miles per gallon, well for every -1 degree C the fuel is dispensed at you will go 556 yards further, and for every -1 degree F just 309 yards.
Assuming all other aspects related to fuel consumption remain unaffected by the associated temperature change .
As djchapple points out the subsoil temperature remains pretty constant.
Big deal there then.
 
Last edited:
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