And of course many gallons get drained early - just a slight increase in OCI can offset cost …
This is true to an extent.
But if someone keeps a 5,000 mile OCI and I implement a "8,046 km" OCI, we are both on the same page now, all things equal, I still lose.
Not sure about oil filters though, and how the pricing differs. Don't get me started on gasoline,
"The highest state average for regular gasoline in the USA today is in Hawaii Gas Prices at $5.46 per gallon, which equals approximately $1.44 per litre (1 U.S. gallon = 3.78541 litres, $5.46 ÷ 3.78541 = $1.44). California follows closely as the second highest"
and then you have this:
"British Columbia currently records the highest average regular gasoline price in Canada, tracking at an average provincial high of approximately $1.85 to $1.88 per litre, with remote or metro regional peaks (such as Vancouver and parts of interior B.C.) stretching past $1.95 to $2.20 per litre"
Canada is a social welfare state that lost the plot 10 - 12 years ago. However, let's keep politics out of this.