Had to have a Jeep

[bmorgil]

After 4 pumps 75# cold is not surprising on a cold or cool motor. 65# is low and that 55# number might just miss once and a while. If you had it warm, a little closer to at least 90# min would have been better. The big difference between the first cylinder and the last is also what you are looking for. That's too far apart. They need to stay within 10 psi of each other or so. That indicates a problem on the last cylinder. If its not using oil, I would say the valve seal is suspect in the last two cylinders. If the oil is getting dirty quick and its showing up on the plugs, the rings and cylinders might be getting worn.

If you have a vacuum gauge, check it at idle. You should have a good solid 17 Hg or so at idle. If the gauge is jumping 4 Hg or so, the valves are too tight or, bad.