oil futures fell sharply on tuesday with us prices down more than 5 as economic worries dulled the outlook for energy demand traders also weighed prospects for a production cut at mondays meeting of major oil producers october wti crude clv22 fell 537 or 55 to settle at 9164 a barrel on the new york mercantile exchange frontmonth prices marked their lowest finish in more than a week a day after settling at their highest since july 29 factset data show