Doing some online comparisons of me and my friend's cars.
My Timeline...
The car I learned to drive on was a '76 Vega "Kammback," with 29.4 cu-ft of cargo space and 81.2 cu-ft of passenger space with the seats up. Seats down changes it to 52.8 cu-ft of cargo and 57.8 cu-ft of people space.
The first car I owned was a '73 VW Passat B1 Wagon. 46.6 cu-ft of cargo space with the seats down and 16.7 with them up. Passenger space was 139.1 cu-ft with all four seats and 109.2 cu-ft with max stowage.
The despised '83 Mercury Lynx 17 cu-ft in the back with the seats up
and 26.4 with them down. Passenger space was 83.3 cu-ft with four seats
and 73.9 with two (tiny back seat!).
The Rust Monster a 76 Camaro Type LT trunk was 6.4 cu-ft (3 of it consumed by the spare) with 85.1 cu-ft for the cabin.
The Silver bullet 79 Camaro Berlinetta trunk was 7.11 cu-ft (3 of it
consumed by the spare) with 83.4 cu-ft for the cabin.
The oft-lamented soul-crushingly underpowered '86 Civic hatchback managed 15 cu-ft of cargo with 70 cu-ft of interior.
The Biscayne SS a '91 Caprice Classic had 20 cu-ft of stowage with a cavernous 114
cu-ft for you and five of your friends. Marv's Impala SS has identical
dimensions. It should be noted that the spare tire takes up about 3.3
cu-ft of trunk space.
Flossie the 2002 Civic sedan had 13 cu-ft of cargo and 91 cu-ft of passengers.
The Precious a 2008 Corvette had 22.4 cu-ft of cargo space and 52 cu-ft of passenger space.
Moxie a 2010 Equinox has 31.4 cu-ft with the back seats up and 63.7 cu-ft with them
flat. Passengers get 104.6 cu-ft with the back seats up. Doing the
math, passengers get 72.3 cu-ft with the seats down.
The Beast a 2012 Caprice PPV has 17.4 cu-ft of trunk space and 112 cu-ft in the passenger compartment.
FuzzyGeff is rocking 12 cu-ft in back and a mere 84 cu-ft up front, the price you pay for the lower roof-line of that two-door '08 Civic.
Marv's noticeably smaller '96 Corvette has a mere 12.6 cu-ft for the junk and 48.7 cu-ft for the people.
JT's 2003 Corvette has 25 cu-ft under the hatch and 51.8 cu-ft in the passenger compartment.
His '08 CTS trunk is 13.6 cu-ft with 96.4 cu-ft for the people.
All of the cars listed, except the Biscayne, Beast, and Camaros can have cargo intrude into the passenger space because there's some form of pass-through from the cargo area to the passenger area.
All of the cars listed, except the Corvettes, can stuff overflow into the back seat.