MikeB4:
Fred99:
MikeB4: @sbiddle
https://gull.nz/fuel/regular-91/
"Gull Regular 91 Octane petrol meets the requirements of all spark ignition engines, contains no ethanol, and is less than 50 parts per million of sulphur. This means it is effectively the cleanest burning grade of petrol out there and compatible with all cars and boats in New Zealand designed to run on 91 Octane"
I don't like the way that statement is written. Sure - "designed to run on 91 octane" is stated later.
You're asking for big trouble if running a car specified to use +95 on 91. Even if it seems to run okay (no preignition etc). Many (particularly Euro) stratified direct injection petrol engine cars need high octane fuel. It gets messy when there are different variants of the same model on the used import market vs NZ new, some may be fine with 91 - others nope.
I will add one qualification though, if you do very low KMs and the car spends a lot of time idle using 95 in a 91 designed engine may help with fuel degradation as the 91 fuel does not have a long shelf life. It is often the cause of the petrol weed eater not starting after winter or the boat that has not been winterised not starting at the ramp, although you should have fired it up way before you took out on its first post winter blast, the busy Saturday ramp is an embarrassing place for your pride and joy to get petrol flu.
The Father is registered with the coast guard, at this time of year since he has the largest most powerful boat with towing capabilities he gets called a few times because people have sucked diesel bug into their launches and need to be towed home... Fun times..