Did you by chance drive the car a very short distance just prior to departing town? You describe a phenomena that has become known as "lawnmower syndrome" where a 4 valve/cylinder hydraulic tappet engine gets a brief run as with backing it out of garage to fetch lawnmower, and then after a several hour or longer sit it has no compression. This occurs for a combination of several reasons: 1. low valve spring force since valves are smaller and lighter 2. the oil that lubricates exhaust valve stems gets cooked on to stem and is turned into a very thick film when the undried condensation from a brief run is present 3. the hydraulic tappets are allowed to over adjust since the oil pump is very effective even at starter speed and the sluggish to close valves due to the goo on stems allow the tappets to overfill and hold valves partially open.

More frequent oil changes and periodically exercising the engine by doing some 5-6 minute periods of over 4500 rpm use will never allow this to occur combined with never running the engine brief periods (less than 3 minutes).

Short runs are a terrible thing to do to an engine as the excessive moisture released from burning of fuel combined with the condensation from engine warming slightly are ripe for formation of acids and actually causing rust on some areas of engine internals like cam lobes and tappet faces.

Conversation heard in my house: "Where did you go?",

"I was moving the truck so I could get the tractor out of shed",

"but you were gone 15 minutes",

"I rode over to the expressway and turned around and came back",

"did you get lost going down the drive?",

"no, I didn't want to shut the truck off until I had warmed it up completely",

"Huh??????".