I track fuel usage every time I drive. This allows me to tweak how I drive. It aslo helps me dial in the custom tune.
Fuel consumption is directly proportional to average speed, and whether you thrash it off the line often.
A graph that I have created, tells me whether I am being economical or heavy footed.
Fuel around town @ 40kmph gives about 14.5l/100km
Highway, dead flat road instantaneous fuel 7.0l/100km.
Trip average 10ish depending on how hilly it is.
2006 WM Caprice Auto - 2017 LS3, 223/228/114 Cam, LS7 Lifters, Headers & full 2.5" Xforce system, Maffless, Twin pod SS Inductions intake with K&N's, Custom OTRCAI,
Customer tuned via HP Tuners, runs 98RON Only.