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120 mile/day, 30 mpg uses 4 gallons, I can easily beat 30 mpg closer to 35 with my 2010 Impala, just set the cruise under 60. (5 days 50 weeks = 250 trips, $3/gallon, $750 more per year than 40 mpg).
35 mpg uses 3.43 gallons/day. $1.28 more per day than 40 mpg, $321/year.
40 mpg uses 3 gallons a day, do that regularly with my 09 Cobalt, not nearly as comfortable or as safe as the Impala.
50 mpg down to 2.4 gallons per day. Save $1.80 a day vs 40 mpg ($450 a year).
IMO once you get over 30 mpg the gains aren't that big. Getting 35 mpg out of the Impala is pretty easy, I've been driving it recently.
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