The best replacement for eon is era.

The best alternatives to eon are rated as following:
★★★★★  era
★★★★★  aeon
★★★★  i10
★★★  british gas
★★★  alto 800
★★★  edf
★★★  wigo
★★★  epoch
★★  beat
★★  alto
★★  trex
★★  npower
★  scottish power
★  celerio
★  santro
★  wagon r
★  spark
★  alto k10
★  mackie srm450
★  prx
★  datsun go
★  suzuki celerio
★  mirage
★  k10
★  mitsubishi mirage
★  british gas which is better
  proton edar
  srm450
  hyundai i10
  brio
  ion
  suzuki alto
  new alto
  southern electric
  essent
  an era
  mackie srm
  verde vex

Your alternative for eon is not listed? Suggest!
Speaking about eon, one probably shouldn't forget about tesco clubcard.

Other search terms related to eon and their ratings are:
★★★★★ tesco clubcard
★★ alto 800
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Google Trends

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eon
era
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