I notice that Hertz in YVR and YYC charges 100 liters for a full tank of gas on SUVs. I have a QX4... and I've driven many other (standard size) SUV's and the biggest I've driven in was the Jeep Grand Cherokee... and that's 80 liters.

So $.72 (hertz's rate) x 100 liters = $72
while $.76 (local gas price) x 80 liters = $60.80 or $45.60 (for a 60 liter tank, like my QX4)

Pre-paid is never a good idea.... so when they ask me... "Would you like to pre-pay for your tank of gas"... I'm like "What's the price of the full tank and how many liters is that"