I've already advised you of your options
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Lockout Service - Gain entry when keys are locked inside the vehicle. Get replacement keys or locksmith assistance.
Flat Tire Assistance & Replacement - We'll replace a flat or damaged tire with the spare, or get the car towed to the nearest service facility.
Jump Start - If your vehicle experiences battery failure, we'll provide a jump start.
Fuel Delivery - if you run our of gas/fuel, we!!!8217;ll deliver 3 gallons (in US/CA) or up to $10 fuel delivery (in AU/NZ) to your location.
”
If you think that your battery will go flat or you will run out of petrol, pay AVIS.
If you have perused the insurance T&C and are happy with the cover provided, get the insurance.
https://www.bettersafe.com/Documents/CHCDWSLI_Insurance_Policy.pdf
What is perhaps unclear to you is that you still have Roadside Assistance even without purchasing the add on or even the insurance to which I have link.
The Add On covers things that could be construed as
your fault.
Battery, as you could have left the lights and radio on with the engine off and could have run the battery down and now the car won't start.
Running out of petrol.....again, self induced.
The insurance covers everything else, including locking yourself out of the car.