Hi ChrisK, sorry back seat does not slide, distance from back seat to rear door is around 38 inches. Top of back seat to back door is around 32 inches.
With the Toyota hybrid it’s not all about how far in ev mode.
Only time I use the EV button is when manoeuvring on drive (to save engine starting)
In slow traffic it automatically uses ev if sufficient charge in the battery.
On a flattish bit of road where you would normally use light throttle to maintain speed ev will come in at speeds up to about 60mph.
When you start to slow down, if you ease off the power to the point ev kicks in ice will stop enabling a gradual slow down without using petrol.
All the miles in ev add to the overall fuel consumptions, last tank of petrol 619 miles 10.4 gall to fill not bad for 2.5lt engine