Hi, In a word yes,
For example, I used to have a Civic VTi and could run more ignition advance on optimax and even witout the ignition adjusted it flew.
My brother has a Integra type R and swears buy it, the car runs smoother and he reckon the cost is offset by you getting more to the gallon as its more efficient.
A freind has a RX7 turbo and on Optimax can run more boost before it pinks (pre-ignition)
And I now have a 1990 8V Golf. and on Optimax its smooth, pulls harder and I agree with my brother, it lasts longer so's worth the cost.
Stu