I doubt you'll see any benefit in P&G with the CVT vs. steady speed cruising at the ultra-low RPM which is its efficiency forte.
P&G works with a manual trans because you can demand a high load at relatively low RPM (the pulse) where the engine operates at optimal brake specific fuel consumption. When you demand high power from a CVT drivetrain, it spools up the RPM past the efficiency sweet spot.
Try it over the same route vs. steady cruising and see if you can see a difference. My bet is no (or worse).
View my fuel log 2014 Mirage SE 1.2 manual: 58.7 mpg (US) ... 24.9 km/L ... 4.0 L/100 km ... 70.4 mpg (Imp)