If you've tried using HVO fuel in your cars, I'd be interested to know what you think of it. How does it perform compared to traditional fuels? Does it have any impact on your vehicle's fuel efficiency or power?
Seems unlikey as new vegetable oil has been just as or even more expensive than pump diesel for some time in the UK.
I have used filtered, de watered waste vegetable oil WVO and SVO, when it was sub £1 a litre, in my om602 engined 190d with no ill effects but that is an indirect injection diesel engine with an injection pump lubricated by the engine oil not the fuel.