tonyhughes: I have a VE Commodore. I put 91 in it, and am only assuming thats what it needs!
Empty now, might put some 98 in it and see how it goes!
My VX SS was dyno tuned on 98, and suffered noticeable power loss on 91/95.
Running my VE on 98. Runs noticeably cleaner than it did on 95 and I've never run it on 91. I'm sure I get (slightly) better mileage on a tank of gas. Always ran the old VT on 98 also.
Pretty sure my VE doesn't like the Bio fuel (E85 petrol/ethanol blend), but I believe the 3.0-litre V6 and 6.0-litre V8 VE Series II SIDI engines handle it. Mine is an older 3.6-litre model (2007).