RE: Wanting similar highway mileage and cargo
Ford FOcus wagon was rated as 22 city 28 highway -so yeah it was over-performing on mileage
Your cargo with the seat down was 55.8 cu ft
Here is the bad news. Not gonnafind ANYTHING with real cargo space that is rated as being able to get you into the mid-30s on gas mileage.
We too need a wagon-type vehicle and have been spoiled by our gas mileage averaging 30 in the winter and 34 in the summer no matter whether highway or city. About the best you will find will be vehicles rated at 28-31 on highway.
Like you we keep them forever -which knocks out the Pirus with its $4000+ labor battery pack and its $3500+ labor touch screen monitor (and around here, it sucks in the snow)
Ditto the VW wagons which are great but which - according to all my mechanics - basically go crazy at 150,000 miles and start running up 4-figure repair bills
DItto the Subarus - makes all my mechanics smile when I mention those and they say 'oh yeah I get to charge you $2000 for a head gasket and timing belt every 75000 miles"......yikes! The 2015-2016 Outbacks all have that same stupid touch screen monitor that controls even the heat - a $4500 repair when the monitor croaks. 2013 Outbacks have the words 'engine' 'oil' 'settlement' and the phrase 'class action' attached to them. 2009-12 - mechanics love those cars (sarcasm off)
List of others that have good cargo, aren't 3 ft from the ground to the cargo bed and get better mileage and don't have the repair costs of Pirus, VW & Subaru and that last
* Honda CR-V (much more cargo than you have now)
* Acura RDX (again more cargo)
*Acura TSX wagon (made 2011-2014) and about 8 cu ft more cargo than what you have
Rav-4 is a maybe as I haven't gotten to measuring it from ground to cargo floor.
If one of the Mazda hatchbacks would work for you on space, those could be good. Can't kill a Mazda engine and they run forever and all mine with those enginesonly need 1 timing belt and water pump over the car's life (and I mean between 193000 -209000+++ so far)