Ill probably be shot for sayin it but its hard to beat the d4d avensis
from what ive heard they are very reliable and pretty good on juice
I have a ghia x Mondeo and as much as i love it to drive,it has cost me a fortune
on repairs-injectors,Dmf,turbo, pumps!!
Im not really fond of Toyota and i think there very boring to drive but if its reliability your after....