I've had Conforti, Autothority, and EAT chips in my former E34 535. Mark's is the best of them, though the difference between his and JimC's isn't dramatic. Since Mark's chips cost quite a bit less than Conforti's the decision shouldn't be difficult. As far as operating costs go, as long as you keep your impulses mostly in check, the additional mileage and driveability (you can shift sooner, for example) will more than offset the higher price for premium.
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