Lean burn usually kicks In right above 2500/65mph and can stay in it up to like 75 or maybe 80 but you have to really really baby it. If you accel to hard it will kick right back out. Its kimd of an art but once you get it, it is like mpg cheating almost . Sounds like you are driving to fast. You might get lucky and get near 40mpg in the summer like that but unless you are willing to calm down and keep it below 2500 rpm and use the shift light you might as well just accept it
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