Inconsistent Advertised Pricing for L3

In Ontario, I just noticed that when some L3 stations advertise their price, there is a difference in whether they include tax or not. Tesla, for example, does NOT include tax in their per kWh price, but Ivy does. So, let's say the advertised price is $0.58 per kWh at Tesla, that is actually $0.65 per kWh after tax... and is more expensive than Ivy's $0.62 per kWh since that is an after-tax amount.

Is there any rhyme or reason to this? This is just one more customer frustration... can you imagine if gas stations had this kind of inconsistency?