yes, I've heard ok na daw problem ng d4d engines. Even toyota have said that they had a problem with d4d's before but it's been resolved. Avonniers who got their avonni of mid 2006 to present has no major compaints at all. Go for D4d best seller ng toyota yan that can be the reason why they're giving out big discounts on vvti variants. If your concern is FE go for d4d but if FE isn't a big factor to you Go for the vvti Gas variant, one of the best Gasoline engine in town.