I am wondering why Nissan uses a compression ratio of 8.9:1 in both the superchargered VG33E and the normally aspirated VG33E. Is it just an ease of manufacturing? Using a higher compression ratio in the non-supercharged V-6 would increase power and efficiency of the engine which would help the only weak link I have found on the X. If you know why they don't bump up the compression, let me in on the secret.
If the normally-aspirated VG33E had any higher compression it would almost certainly need premium fuel. People don't like hearing that these days unless they are buying something intended to be high performance. My '84 VF1100S has 10.5:1 compression and pings like mad on anything less than 92 octane.