My FoST with E30 tune vs 91 tune saw a difference of 2-5 MPG. Driven 'similarly'. My Best MPG was always on 91 (with the typical 10% eth).
But the gains from a custom tune on E30 was Very noticeable, to the point of addicting...and I always needed to find the next hit of E85... haha
But the gains from a custom tune on E30 was Very noticeable, to the point of addicting...and I always needed to find the next hit of E85... haha
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