Car
Years | space seats-up/seats-down | EPA fuel mileage
- Toy Prius v (gasoline)
2012-2017 | 34.3/67.3cf | 41mpg
- Toy 3rd gen Prius (gasoline)
2009-2015 | 21.6/40.0cf | 50mpg
- Toy Prius Plug-in (plug-in hybrid)
2012-2015 | 21.6cf/40.0cf | 50mpg?/95mpg-e
- Toy 4th gen Prius (gasoline)
2016-present | 24.6or27.4cf*/? | 56mpg
- Toy Prius Prime (plug-in hybrid)
2016-present | 19.8cf/? | 54mpg/133mpg-e
- 1st gen Honda Insight (gasoline)
2000-2006 | 16.0cf | 53mpg
- 2nd gen Honda Insight (gasoline)
2010-2014 | 15.9cf/31.5cf | 42mpg
- Hyundai Ioniq PHEV (plug-in hybrid)
2017-present | 23cf/? | 52mpg/119mpg-e
- VW TDI Jetta Sportwagon (diesel)
2005-2008? | 32.8/66.9cf | 41mpg
- Nissan Leaf (electric)
(avoid 2011-early2013's and any 30kWh)
2011-2016 | 24/30cf | 114mpg-e
Sorry! I just quickly googled all this and couldn't find a lot of stuff off hand. Plus I may be a little off, like I couldn't quite figure out if the Prius Plug In was built until 2015 or 2016. I also couldn't find information on length of stuff that will fit. So take this list for what it is.
* The fourth gen Prius has different cargo spaces according to trim. Base trim has the smallest space.
The biggest car here is the Prius v, but also has the worst fuel mileage on the list at 41mpg combined (EPA).
The VW TDI Jetta Sportwagon is close behind in size and is also rated at 41mpg. But remember that the "41mpg" is according to EPA tests with the emissions cheat disactivated. So real world fuel mileage should be better just as real world emissions should be worse.
The first gen Honda Insight is that little three door two seater IIRC that gets exceptional fuel mileage for it's time. But it's also a bit older than what you were looking for, and there are newer options, like a 4th gen Prius, that not only fit your years you're looking for, they also get around the same fuel mileage, if not a bit better (at least according to the EPA) as well as being much bigger cars.