I wanted to have a good overview of fuel economy, so I prepared a summary of all reports I found on this forum. You'll find there original economy as reported by a user + mpg + l/100km versions. Maybe it helps someone
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User Model Original In mpg In l/100km Comment
Carjack G20 330i RWD 40.7 mpg 40.7 mpg 5,78 l/100km "distance about 60 miles return at speeds varying up to 80mph"
ProfoundTwitch G20 330i RWD 40 mpg 40.0 mpg 5,88 l/100km "80 miles on highway" "interstate at 75-80" + "highway at 60-65"
Lrscpa G20 330i xDrive 39.7 mpg 39.7 mpg 5,92 l/100km "EcoPro mode, with cruise on at 75-80mph for 95% of the trip", "401mi"
drexplode G20 330i RWD 39.4 mpg 39.4 mpg 5,97 l/100km "72.2MPH//717 miles"
sanch8 G20 330i xDrive 6,25 l/100km 37.6 mpg 6,25 l/100km "120ish in comfort mode"
Beembar51 G20 330i xDrive 37.3 mpg 37.3 mpg 6,31 l/100km "Most of those miles were done at 80 mph"
klokan G20 330i RWD 6,50 l/100km 36.2 mpg 6,50 l/100km "half trip open road, half trip highway, avg speed about 90 km/h"
Lrscpa G20 330i xDrive 35 mpg 35.0 mpg 6,72 l/100km "Cruise Control for approx 300 of the 400 miles (last 75 miles was on 2 lane roads)"
opti2k4 G20 330i RWD 8,30 l/100km 28.3 mpg 8,30 l/100km "highway (...) in comfort mode and speed set at 155km/h"
sanch8 G20 330i xDrive 12 km/l 28.2 mpg 8,33 l/100km
klokan G20 330i RWD 9,20 l/100km 25.6 mpg 9,20 l/100km "average (trip / city / country roads)"
ProfoundTwitch G20 330i RWD 21.7 mpg 21.7 mpg 10,84 l/100km "almost exclusively short trips in the city, in stop and go traffic"
PhrogFixer01 G20 M340i xDrive 34 mpg 34.0 mpg 6,92 l/100km "trip today from MD to OH through the mountains (...) in comfort"
Delta5 G20 M340i RWD 31.4 mpg 31.4 mpg 7,49 l/100km "90% rural/65-75mph highway and 10% light-traffic city driving"
Wineguy G20 M340i (?) 26.5 mpg 26.5 mpg 8,88 l/100km "80% freeway"
insidejoke123 G20 M340i RWD 25.5 mpg 25.5 mpg 9,22 l/100km "comfort mode with a mix of stop/go traffic and 70mph cruising"
hawk14414 G20 M340i xDrive 25.2 mpg 25.2 mpg 9,33 l/100km "a mix of highway and in town driving" / "very little traffic"
Frank_NJ G20 M340i xDrive 25 mpg 25.0 mpg 9,41 l/100km "combined driving and using Sport Plus a lot"
PhrogFixer01 G20 M340i xDrive 25 mpg 25.0 mpg 9,41 l/100km "stop and go and highway"
BMW_Midlo_Man G20 M340i xDrive 9,80 l/100km 24.0 mpg 9,80 l/100km "Comfort"
xraymd G20 M340i xDrive 23 mpg 23.0 mpg 10,23 l/100km "Mixed freeway and in town"
ByronWalter G20 M340i xDrive 22 mpg 22.0 mpg 10,69 l/100km "mostly urban/suburban driving with moderately light traffic... and 95% of the time in sport"
nola2atx G20 M340i RWD 18.5 mpg 18.5 mpg 12,81 l/100km "very spirited driving, mostly in sports plus mode"
BMW_Midlo_Man G20 M340i xDrive 13,00 l/100km 18.1 mpg 13,00 l/100km "not actually worried about mpg when rolling in Sport+"
insidejoke123 G20 M340i RWD 18 mpg 18.0 mpg 13,07 l/100km "sport+ in my small town (...) little traffic but tons of lights"
RPM1123 G20 M340i xDrive 17 mpg 17.0 mpg 13,84 l/100km "sport+ and roll on the throttle a lot"
PandaMobile G20 M340i RWD 15.6 mpg 15.6 mpg 15,08 l/100km "brutal in terms of heavy traffic" + "eco pro alot when in traffic"