On page 110, the 2e vehicle speed conversions
COMBAT SPEED: To translate a 2nd edition vehicle to 4th
edition, divide the 2nd edition Combat Movement values
by 7, rounding fractions down.
TRAVEL SPEED: To translate a 2nd edition vehicle to 4th
edition, divide the 2nd edition Combat Movement values
by 14, rounding fractions down.
1) Are these division values correct? Feeding some test data into the conversions, the numbers came out very low.
2) Is travel speed supposed to be calculated from combat movement? In the 4e manual most travel speeds are ~2x larger than combat speeds, this conversion results in the travel speeds being 2x slower.
Test results can be seen
here under "2e conversion results" sheet