It's a common misconception that "premium" gas is somehow "better" than regular unleaded. All the octane numbers refer to resistance to premature detonation. Higher end cars require greater resistance to detontation because they generally run at higher compression ratios. The bottom line is always use what is recommended by the manufacturer - if the owner's manual says use regular then putting in "premium" will not give any measurable advantage in terms of either performance or fuel efficiency for a properly maintained engine.
Anyhooooo, that aside I do agree that you should run RO/DI even in the GVRD not because you have to (you don't) for water QUALITY but for CONSISTENCY. Several times crews have been mucking around outside or there's been a large rainstorm runoff and the TDS has shot up dramatically for short periods of time. With RO/DI you have those extra layers of protection as it were to maintain a consistent end product.
As Aquattro mentioned, there are a myriad of uses for rejected RO water - my wife uses ours to water her garden.
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