two identical engines will run with some degree of diffrence
thats why i said start with $5.00 of the lower or mid grade gas and see how it runs.
Elevation and other factors have alot to do with it.
at sea level i run 6 points higher octane with octane boost. for comparable performance up here in Calgary
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89 with 331 t3'/t4 hybrids. upr Suspention worked out finnaly . 9.89 144 mph .
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