(Once in Iberia Plus you can easily move your Avios across to British Airways Executive Club or avios.com via the ‘Combine My Avios’ function online.)
Until the end of February, Iberia is offering triple miles on all Hertz rentals. The current deal – 300 Avios per day – is already attractive, so this is very impressive.
Private rentals earn from 300 to 450 Avios per day depending on the size of car rented. Tripled, this will rise to 900 to 1,350 Avios per day.
Rentals booked using a corporate discount code only earn half of the above rates.
You must rent for a minimum of three days to get the ‘triple Avios’ deal. There is a list of 775 ‘qualifying Hertz establishments’ on the website which is impossible to search, but I assume it must cover pretty much every Hertz depot, at least in Europe.