The best replacement for direct injection is fuel injection.

The best alternatives to direct injection are rated as following:
★★★★★  fuel injection
★★★★★  common rail
★★★★★  port injection
★★★★  electronic fuel injection
★★★★  multi point injection
★★★  fuel injected
★★★  multiport
★★★  sequential mpi
★★★  carburetor
★★  indirect injection
★★  port fuel injection
★  efi
★  crdi
★  naturally aspirated
★  sequential fuel injection
★  multi port
★  mpfi
  multi port fuel injection
  sfi

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Google Trends

Scale is based on the average worldwide traffic of direct injection in all years. Click on graph for more.
direct injection
fuel injection
common rail