Surely only until the battery runs out, how far will it run on JUST the battery?
Is this based on actual personal experience, Lexus "claimed" figure or on fuelly.com?
On battery only you can go quite a fair distance. Not a huge amount but I've travelled for 60 seconds around a mile I've never measured tbh.
Ill turn on eV only when for instance I'm in gridlock traffic or a huge queue behind some traffic lights otherwise I let it do its thing.
As for real world mpg. Again it's not my car it's the wife's. We top up with £40 of premium petrol and it lasts for 400 miles or thereabouts. That is with stop start city driving during rush hour every weekday.
For long distances you are probably better off with a diesel self charging hybrid if such a thing exists or diesel only.
Self charging petrol hybrid are city cars. Not long distance cars. That doesn't mean you can't use them for long distances but you would likely be better off with a diesel as they will be cheaper and do similar or better mpg.
If you want next time we fill up I can zero the miles and see how long it lasts.
However our usage is city driving during rush hour. So not constant high speed.
The car charges itself when you are braking, rolling, going downhill, etc. Electric motor kicks in below 16mph or over when it can. It normally uses both when over as in at 70mph you can be using both electric and petrol to keep you moving. So it's using the electric all the time turning on and off when needed.