Join Date: Apr 2016
Location: Austin, TX
Model: Ford Taurus
Engine: 3.0L 12v Vulcan V6
Rep Power: 7
Two vulcans (07 with engine code 'U', 05 with '2') - 05 never gets over 23mpg on highways, 07 tends to get 28-30 mpg.
Same 89 gas and driving style - they have also been serviced the same way - fuel filter, air filter, spark plugs, wires, belt, gaskets, mobile 1 full synthetic fluid, occasional gumout regane complete fuel system cleaner, etc.
On a related note, 05 used to throw misfire code on 87 gas, so I switched to 89 years ago - no more misfire codes - still bad mpg. 05 also sounds like a 'bull' under throttle while 07 'whines' - stock exhaust on both. What am I missing? Thanks.