Here's a "Hmmmmm!" thought for you.

[Tambu]

Thank you, Schoenwulf!  You have made my point! 

GG

Actually, I think that Schoenwulf's calculations indicate that tanks at 1.5 MP per clear hex is unrealistically slow in the 4th edition PG rules as published.

AFVs should move at 1 MP per clear hex and 2 MP when traversing a hill slope. The opposite point of view seems far more realistic.

I think that the same rationale applies for road movement, as both foot units and mechanized should not be shackled to the unrealistic same speed of 2/3 of a MP per road hex.