I think CA is messing with the E in our gas.About every 3 weeks I take a 750 mile trip to the Sierras.My 2017 Yukon for the last 3 years has been dead on 21 MPG like clock work.My last trip was 22.2 and the one before was 19.1.My car is a Flexfuel car so the computer is set to run any E level.I always run 87.Makes me think that some of the gas is getting a higher load of E than 10%?Tom
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