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BroadHopper · 06-17-2010, 12:19 PM

My daughter gave me a Garmin Nuvi 255 for Christmas. I am trying to get the most out of it. I downloaded the Winni map and installed it. I use it last Tuesday for the first time. I neglected to reset the trip odometer, so I do not have MPG result. Once I set it up, I should be able to calculate the mpg.

I do know that GPS are only accurate in a straight line. It is the only way I can calculate distance.

I notice the VDO speedometer with the pitot tube is fairly accurate around 30 mph. Before and after that it records the wrong speed exponentially as you go slower or faster.

I will let you know what I find out.

06-17-2010, 12:19 PM	#21
BroadHopper Senior Member Join Date: Oct 2004 Location: Laconia NH Posts: 5,570 Thanks: 3,206 Thanked 1,101 Times in 793 Posts	MPG vs GPH My daughter gave me a Garmin Nuvi 255 for Christmas. I am trying to get the most out of it. I downloaded the Winni map and installed it. I use it last Tuesday for the first time. I neglected to reset the trip odometer, so I do not have MPG result. Once I set it up, I should be able to calculate the mpg. I do know that GPS are only accurate in a straight line. It is the only way I can calculate distance. I notice the VDO speedometer with the pitot tube is fairly accurate around 30 mph. Before and after that it records the wrong speed exponentially as you go slower or faster. I will let you know what I find out. __________________ Someday may never be an actual day.