For about four years, one night each week I’d head east from Oxnard to Newbury Park on Potrero Road, the old Conejo Grade, much was steep and winding with fine curves…ideal for my Mustang ragtop. Returning uphill at 10 PM, Potrero had no traffic at all, and I could let the Mustang be the sports car Ford designed. When approaching a curve, I let off the gas to decrease my speed…braking while turning doesn’t give you optimal control. No one ever caught or passed me on that road, and I felt pretty confident about my cornering, until…