You don't need that much more throttle on a petrol car tbh. The best way to know how much clutch/throttle you need is to feel the engine through your foot - you can feel the judder if you're not giving enough gas. Every car is different - for example, the 1.0 fiesta I learnt in needed a good amount to pull off, but my mum's 1.4 corolla can move off quite easily without any throttle.
Remember, the idea of passing your driving test is that you should be able to handle any car from a G-Wiz to a Merc GL down any public road safely and efficiently.
Remember, the idea of passing your driving test is that you should be able to handle any car from a G-Wiz to a Merc GL down any public road safely and efficiently.