Ford tumbled to nearly the bottom of an annual survey of vehicle reliability due to flaws in its touch-screen navigation and entertainment system, while Japanese automaker Toyota swept the top three spots. In a Consumer Reports survey released yesterday, Ford fell seven spots to 27th of 28 brands surveyed overall, while its upscale Lincoln brand fell 12 spots to 26th place. Two years ago, Ford placed in the top 10 with more than 90 per cent of its models being average or better. The survey is based on data over the past three years. While mechanical problems are now rarer, for all brands electronic systems are where more issues tend to occur.