I had a GSR and i think they recommend high octane 91+ like on the prelude with Vtec also they recommend 91+. My gsr got stolen so i just got a prelude SI vtec for a good price and it has a lot more space up front but almost no space in the back. I could actually fit more people on the back of the GSR than on the prelude! Weight difference the GSR is around 2700 lbs and the prelude is about 2900 lbs... so big difference, but also big difference in torque and power. i am yet to push the lude to it's limits so i cant provide a comparison but i could definitely hear and feel the vtec kick in more on the prelude than on the gsr.
good luck. ludes are very rare to find too so i reconsidered of getting a lude instead of another GSR.
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