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I've found that economy differences with E0/E10 depend on the engine.
I can buy E10 at about $1.50/litre, or E0 at plus 2 or 3 cents/litre. They're both 91 RON octane.
I found E0/E10 made little difference in "BoB" - 88 Mitsubishi 4G37 with a carby.
Same story with "Zed"- 81 Nissan L28 with EFI.
On the other hand, Baa - 98 Mazda BP-ZE with EFI, gives enough FE increase to more than cover the extra cost of E0.
I guess you weren't looking for a "try it and see" answer, but that's what I'd advise.
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