mixture of RON95 and RON97, go try it, i have been doing this for my scooter and kancil, fuel consumption wise, no difference
the only difference i can feel and see is the power/torque at high speed...

for example, if fully RON95, my kancil hard to reach 100km/h, even if it does, the engine roaring sound very loud and steering shake like hell
but when i put fully RON97, easily reach 110km/h and engine roaring sound less and steering shake normally like driving 80km/h....then maintaining in 100km/h is piece of cake...

then i tried to mix half tank of each RON (kancil is 20 liter), so 10 liter each, give some effect like its on fully RON97


to add and emphasize again
- higher RON number doesnt mean saves fuel