Reply to "RPM for highway cruising"

Ron O1984/2010 IM, B.C. Canada

I knew my speedometer was off, so today, when I went out for a drive, I brought along my GSP. Looks like my speedometer is off by approximately 9%.
At a corrected 70 mph my tach shows 3800 rpm, and at 75 mph it shows 4000 rpm. Is this considered too high of a cruising speed for our engines? My IM will do a lot of cruising and most will be in the 70-75 mph range.

12/21/105:32 PM

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