Glad I found this thread...was just gonna start a new one to see if my MPGs are normal. Sounds like they are.

80% highway driving - 25 MPG.

I was hoping it'd be a little better. Our 01 Regal GS used to pull 30-32 MPG out of highway driving. The Bonnevilles we owned were always better too. Why do the L67s in the GPs net lower MPGs than in the Regals, PAUs, Bonnevilles, etc.?