What should I be paying?
It's the economy, stupid. Even on WLTP it hovers around 50mpg, and you might well do that. Hybrids also have the odd quality of making better economy in town than on the motorway.
With the hybrid RAV4 producing 126g/km of CO2 in its cheapest guise, fist-year tax will cost you £170 and then £145 annually thereafter. The plug-in hybrid only produces 22g/km (on paper, anyway), and so there's no tax to pay for the first year of ownership.
Brilliantly low Benefit-In-Kind offers another reason to opt for the RAV: that 41 miles of electric range earns it a BIK rating of just 7%, although even this isn't quite as tempting as the 1% rate currently offered on fully electric vehicles.
The RAV4's hybrid fuel economy is real, whereas that of the plug-in hybrid is almost entirely at the mercy of how frequently you plug it in to charge the battery.
No-one ever accused Toyotas of unreliability, and the complicated hybrids suffer not at all. So residuals are also class-leading.
Oh and finally, Toyota as a company can borrow money at favourable bond rates, so the in-house bank can lend to you cheaply. Combine that with the strong residuals and you have, with a deposit of £8,500, most versions falling under £300 a month over three years.
Spec is pretty strong. The £31k lead-in car has the central touch-screen and active cruise with frontal safety radar, and a rear camera. But you'll probably want to move up to the mid-spec (Design) for sat nav, given there's no phone mirroring, and also because it brings bigger wheels and the chance to buy 4WD.
If it's the plug-in hybrid that appeals the most, brace yourself for the fact that it will cost you in excess of £46,000 for even the most basic version.