First and foremost, I love RON 95 because it is cheaper than RON97. Nevertheless cheaper fuel doesn't mean it is inferior.

I'd driven thousands of kilometer to test Peugeot 308 140THP Auto for fuel economy and engine performance running on RON95 and I didn't find any 'lacking' at all.
For instance fuel consumption by the Peugeot 308 running on RON95 can be better than most cars of engine capacity above 1.5liter. On performance, Peugeot 308 140THP Auto still capable to out perform most [if not all] stock cars up to 2.0liter [non-turbo, non-mod of course] , even BMW E90 320i Auto and
Mercedes Benz W203 C180k Auto could be smoked without difficulty!
1. Fuel EconomyConsumes as low as 6.0~6.4km/100km [10.8~ 11.5 sen/km] when driven 'economically' on autoCruise without exceeding speed limits on highways. Also still can achieve around 7.0~7.5liter /100km [12.6~13.5sen/km] on long distance trips when driven normally like most people do. When pushed a little bit harder still low on consumption of around 8.0liter/100km [14.4sen/km]. Click
HERE for more info on fuel consumptions.
2. PerformanceWhen flooring the accelerator pedal for speeding above 180km/hr one can forget about the fuel consumption - still consuming just around 10~11liter/100km [or 18~20sen per km on RON95] though.
My
latest test against 2.o liter n.a saloons [European and Japanese marques] was Sunday 11th October 2009 around 2:40pm on PLUS [Northbound]. As a comparison, Peugeot 308 140THP running on RON95 could outrun
BMW E90 320i Auto on acceleration from 150km/hr to over 180km/hr. The 'test' was performed a few times until the 'babarian' gave up. Of course BMW E90 320i has higher top speed on paper but during daylight driving on PLUS, especially on Sunday afternoon who can speed up to and sustain more than 180km/hr?
During accelerating from 150km/hr to 185km/hr at some points I had to ease the accelerator pedal momentarily before 'slower' cars on fast lane gave way. Before hitting higher speeds more than 186km/hr [190km/hr on speedometer] I had to brake hard again, there were always slower cars ahead. The speed dropped around 150km/hr, floored the accelerator again to kick down into 3rd gear and pulled away while watching BMW320i reflection in rear-wiew mirror were getting smaller, every time. Weighing about 100kg lighter and having 40Nm extra torque are actually the reasons to edge-up against this
musuh tradisi.The only way to hit max speed was driving on PLUS after mid night as i did on 1st March 2009. The speedometer read 4km/hr more than the GPS data logger, i.e
210km/hr. I've not try running on RON95 yet. Certainly I'll do one day.

[
updated on October 24th, 2009 : Click
HERE for the New speed record on RON 95]
What 'extra' can u really get out of RON97 or higher octane fuels? Probably 'extra' money to pay for. That's all. Remember that Peugeot 308THP and even 308GT aren't hot hatches eventhough their performance match 2.0 liter saloons. RON97 will
not make 'em hot either. If u want better game go play 'Polo' if can't afford 'Golf'.
Summary on RON95 testsCoverage: 4000+km in 6 weeks throughout Peninsular Malaysia [Malaya] since Sep. 1 2009.
1. Acceleration:0~100km/hr in 9.3 sec.
0~160km/hr in 23.5 sec.[updated]
150km/hr~180km/hr in 16sec.
2. Average fuel consumptions: 6.0liter/100km on PLUS at 92km/hr
6.2liter/100km on PLUS at 110km/hr
7~8liter/100km on start-stop interstate trunk roads
10~11liter/100km for short start-stop and city driving in traffic jam.
11~12liter/100km when driven above 180km/hr
[All figures are based on tests posted earlier in this blog]
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