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http://stockcharts.com/freecharts/perf.html?TMF,edvTMF has more volume and options, which EDV doesn't have. Not for the faint of heart, though.
TMF expense ratio almost 1% a year--EDV .13% a year.
Thanks for the replies . Did check ZROZ very similar but low volume as well and TMF will lose time value due to options time decay , will keep checking the trade logs for liquidity.