You need to at least check your odometer against mile markers or GPS. My odometer reads 10% high even though the speedometer is spot on. I have to multiply my indicated mpg by .91 to get true mpg.

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Current Stable

• 380SL (diesel)
• Corvette C5
• Manx
• Baja Bug
• F350 Powerstroke
• Auburn Boattail Speedster replica