My Gen 1 truck has the G63B 2.0 in it. On the fuel filler door there's a decal stipulating 97+ octane fuel but I bet every owner cheaped out on it and filled it with regular pump. It seems like a pretty exotic fuel to use in a 4 cylinder truck made in the mid 80's. This isn't a feedback operated carb and doesn't have an O2 sensor in the exhaust - Australian delivered trucks 'may' have a higher CR but I don't know/doubt it. I use the equivalent of premium in my Hyundai beater wagon. There is a definite difference in engine behaviour compared to regular pump (bearing in mind this is a 16v twin cam 2.0). It idles and runs smoother, has better throttle response, more torque and improved power all round. I have tried using 98 in it and it felt down on power and torque (not what I expected). It still idled and ran as smooth as 95. Only way to get the best performance out of your engine is to test different fuel and tune combos...
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