The most traded U.S.-listed oil exchange-traded funds opened higher on Tuesday, closely tracking a small rise in oil futures, as investors weigh Venezuela’s short-term supply and hedge exposure to the crude futures through the ETFs. United States Oil Fund (NYSEARCA: USO) was up by 0.56% as of 9:35 a.m. ET on Tuesday, mirroring a 0.7% increase in front-month crude oil futures. United States Brent Oil Fund (NYSEARCA: BNO) gained 0.54%, Invesco DB Oil Fund (NYSEARCA: DBO) was up 0.65%, and ProShares Ultra ...