I am pretty sure that 29 in. Hg is considered "perfect" vacuum at sea level. So, 28 is pretty dang on the money

__________________
Thanks,
Mark in NC

"Spark plugs?...We don't need no stinking spark plugs!"
1985 300SD "Der Silberne Schlitten" 420,000 mi


Wish these were diesel:
2003 Ford Club Wagon 130,000 mi