When I started designing PCBs, I was given an advice to route GND with 50mils and VCC with 25mils. But now I read on the net that VCC should be wide, also. I make two-layer digital boards only. If I now adjust my VCC tracks to 50mils, is there any chance of some problems? And should I adjust? All prior boards work... Maybe I should note that all my previous boards were built around discreet chips, GALs, SRAM and Z80, but am now moving towards 180 MHz ARM and FPGA.