There are a few seven-seat hybrids on sale. The Toyota Prius+ is one of the most affordable and can, theoretically, return up to 61.4mpg - our readers report they see 50.8mpg on average (www.honestjohn.co.uk/realmpg/toyota/priusplus-2012). The rear seats are only really suitable for children, however, and using them doesn't leave much boot space. It's not great to drive, either. Other than that, there's the Renault Grand Scenic Hybrid Assist, but that only offers a small improvement in economy over the normal diesel version. There are also hybrid SUVs like the XC90 T8 but they're expensive.