esso

if u really have those problems, call esso customer service, provide ur receipts, we are sure will investigate, even if u find other esso's price higher than other stattion (at Montreal Island) more 2 cents, you can call us too.
i am working for esso. tell u the truth, esso don't have Refinery in quebec, the refinery at montreal is Shell and Petro Canada, Ultramar is at quebec city. and all esso stations at montreal and surrounding area, buying from Shell Refinery under the account of esso. Instead, shell station buy gasoline from Esso refinery at Moncton. and all gasoline are sample examined by batch.
The Gasoline at the market, should be the same, except those high grade gasoline, like supreme (range from 91-93). but the gasoline regular must be the same. from big company like esso to small company like petro t.
For the water in gasoline, it is rare situation, cause all the tanks are inspected by the goverment every 2 yrs, by esso at each delivery, water in tank not more than 5 cm, the pump only pump till 20 cm to the bottom, be note water is heavier than gasoline.
once again, if you have questions please call us at 1-800-567-3776 .

esso

all gas pump volume is corrected at 15 degree
according to law made by Measurement Canada, for 1000L (+-2.5L)
internal esso regulations, for 1000L (+-1.5L)

if you go to gas station, pay attention to the pomp, should have a sticker from Measurement Canada, stating the date this pomp inspected.
and at gas station site, all pomps should be measured once a 12 monthes by the professional, and keep the records for Measurement Canada

the gasoline change volume according to temperature.
like at 1 degree, 1L volume which we can see in measurment, but after corrected to 15 degree, it is 1.018L, means in winter time, when u tank 1L in ur tank, u pay for 1.018L
same when it is 30 degree, 1L volume which we can see, corrected to 15 degree, it is 0.981L.

if you can see big differents (more than 0.25%),  call the customers service number of the company or call to measurement canada.

-esso