I confirmed you observations when I reran the routines @ 16MHz and PBPL.

I did notice if you use PBP's "DIG" command, the number of instruction cycles used are not consistent for various 4 digit numbers.

Here is the data I collected.

Code:
Algorithm 1:
Pressure = 1234
'Start Stopwatch in MPLAB Simulator
tmpDig0 = Pressure dig 0
tmpDig1 = Pressure dig 1
tmpDig2 = Pressure dig 2
tmpDig3 = Pressure dig 3
'Stop Stopwatch in MPLAB Simulator

Algorithm 2:
Pressure = 1234
'Start Stopwatch in MPLAB Simulator
tmpDig0 = Pressure // 10
tmpDig1 = Pressure / 10
tmpDig2 = Pressure / 100
tmpDig3 = Pressure / 1000

tmpDig1 = tmpDig1 // 10 
tmpDig2 = tmpDig2 // 10
tmpDig3 = tmpDig3 // 10
'Stop Stopwatch in MPLAB Simulator

Algorithm 3:
Pressure = 1234
tmpDig0  = Pressure // 10 
pressure = Pressure / 10 
tmpDig1  = Pressure // 10
pressure = Pressure / 10
tmpDig2  = Pressure // 10
tmpDig3  = Pressure / 10
'Stop Stopwatch in MPLAB Simulator


PBPW @ 16MHz
Algorithm   Inst Cycles     Time
1           2958            739.50 us
2           2086            521.50 us
3           1783            445.75 us

PBPL @ 16MHz
Algorithm   Inst Cycles     Time
1           9626            2.406500 ms
2           6830            1.707500 ms
3           5839            1.459750 ms
Obviously PBPL slows down the routines considerably.

Good luck.