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Green Machine · 02-26-2008, 07:59 PM

My GPS and my SG II agree on my speed. The speedometer shows about 3-4 mph lower than both. I tend to think the GPS and SG are more likely to be correct. What does the group think??

I believe the SG and the speedo are getting the same info from the computer. I think maybe the actual speedo needle isn't very calibrated. The trip odometer is accurate to within 1/10 mile for every 100 miles driven.

Thoughts?

02-26-2008, 07:59 PM	#1 (permalink)
Green Machine EcoModding Lurker Join Date: Jan 2008 Posts: 14 Green Machine - '05 Chevrolet Aveo Thanks: 0 Thanked 0 Times in 0 Posts	What to believe (ScanGauge & GPS vs. speedometer) My GPS and my SG II agree on my speed. The speedometer shows about 3-4 mph lower than both. I tend to think the GPS and SG are more likely to be correct. What does the group think?? I believe the SG and the speedo are getting the same info from the computer. I think maybe the actual speedo needle isn't very calibrated. The trip odometer is accurate to within 1/10 mile for every 100 miles driven. Thoughts?