Patman
Staff member
Does Shell premium use ethanol down there? I know up here in Canada that Shell's 87 octane has 10% ethanol, their 89 octane has 5% ethanol and their premium (which is only 91 octane here) uses no ethanol at all. So there is a nice boost in MPG just from that alone (I see a 10% improvement in MPG in my Corvette running non ethanol premium from Shell or Costco compared to the 10% ethanol enhanced premium from other stations)