Jump to content

Speedo Vs Average Speed


motowpk

Recommended Posts

Comparing the speedometer indication to roadside radar speed displays indicated the speedo reads high - not unusual in many vehicles. On a recent trip with many opporunities to maintain a constant speed I compared the speedometer read out to the average speed indicated on the information display on several occasions. Consistenly the speedometer read higher than the information display average speed. For example, at 74 mph on the speedomoter the info display average speed is 70 mph.

This makes me wonder if the average speed on the information display is from the NAV system and thus GPS based providing a more accurate indication than the speedometer and thus provides a correction factor to one's speedomeoter.

Comments? Thoughts?

Link to comment
Share on other sites

Comparing the speedometer indication to roadside radar speed displays indicated the speedo reads high - not unusual in many vehicles. On a recent trip with many opporunities to maintain a constant speed I compared the speedometer read out to the average speed indicated on the information display on several occasions. Consistenly the speedometer read higher than the information display average speed. For example, at 74 mph on the speedomoter the info display average speed is 70 mph.

This makes me wonder if the average speed on the information display is from the NAV system and thus GPS based providing a more accurate indication than the speedometer and thus provides a correction factor to one's speedomeoter.

Comments? Thoughts?

My speedometer reads 2-3mph fast at all speeds (in excess of 60mph to 100mph), checking against a GPS. I don't have the Lexus NAV, but a 'portable' Garmin.

Link to comment
Share on other sites

Even in my old non-nav 00 LS400, the average speed shown in the trip computer is much more accurate that the high reading of the speedometer. My guess is that the speedometer in our cars is purposefully set to read a little higher that the true speed.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.



×
×
  • Create New...

Forums


News


Membership


  • Unread Content
  • Members Gallery