IIRC, Rob Jax (who was a genuine expert on matters fuel) reckoned that the premium petrol wasn't worth buying because it really had no effect (the mind is a very strong influence..) but that the premium diesel did offer a very minor improvement.
I did try both, being the cynic I am, & concur with his conclusions. So I just use the standard stuff.
a few years ago we took a Lexus RX400h hybrid for an extended test drive. We were very impressed with its quietness and it was certainly quick off the mark. This used two electric motors and a standard petrol V6 engine.
After some discussion I made an offer for their demo, which was accepted. However, an hour or so later the manager, who we had been dealing with, 'phoned me back to say he was a bit worried about us using it for towing a fairly heavy 'van and had sought further advice from Lexus. Their feeling was that for most of the time, due to the weight, the petrol motor would be running which would result in very poor fuel economy so he couldn't advise us to continue with the purchase.
We'd previously lined up a test drive in a TDV8 Range Rover so we went ahead, and that was a completely different kettle of fish!
Nevertheless, we were both very impressed with the integrity of the Lexus manager and the Lexus itself.
Wow! nine-hour battery life for a PC laptop's very good; of course it doesn't compete with SWMBO's Macbook Air which lasts for twelve hours...
I'm sure we can all relate tales of broken computers, in fact the nightmares I had with PCs finally led me to Macs, and I've had no problems since making the change. Personally, I'm not interested in playing games but let's face it, neither Macs or PCs are good at that, they're for working on.
To the OP - just try both types and make your own mind up.