IIRC in France 1940 Czech tanks were about 350 of 2200, and grouped into their own divisions. The Germans could organise a 'petrol corps' with odds and ends of petrol powered AFVs and supply vehicles, they could scale that up in Russia in 1941 using the petrol powered vehicles they get from France to have a petrol Panzergruppe.
As for scrounging petrol in France, I know its bought up a lot but how much difference did it really make? And what's more given that all thins being equal a 1440s diesel engine will be at least 50% more efficient than a 1940s petrol engine I doubt there would be nearly as much need to scrounge fuel.