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You'll get higher numbers running in 5th (assuming you're not heat soaking), BUT it's a lot harder on the motor, especially in the lower rpms because you're creating a very high load situation going full throttle and 2,000rpms (i.e., low rpm, heavy boost). High load can create over-boosting at boost onset and worse, severe detonation. The 5th gear run will generate a more heat as well because......it's a much longer run. I would strongly suggest running in 4th. It's just better for the motor and you should still get very solid and usable data. If you want to know what the 5th gear numbers are, simply multiply by 1.5% and that will give you a general idea.
If it's available, run 93 octane. Put the biggest fan(s) you can in the front the IC and radiator.
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The forest was shrinking, but the Trees kept voting for the Axe, for the Axe was clever and convinced the Trees that because his handle was made of wood, he was one of them.
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