graph

I have a Dec 2012 W204 C220 CDi Executive SE Blue Efficiency. My problem is trivial but I have been unable to find a solution. There is an instantaneous MPG meter together with a remaining range which displays on the speedometer, which only seems to go to 40 MPG. And there is a bar graph...

I have a C300 Hybrid with Audio20. There is a single, real-time consumption bar on the small display on the instrument cluster and a larger per minute consumption graph on the center screen. In my case although the instrument cluster one goes up to 80 mpg the graph only goes up to 40 mpg...

For some reason I've been leafing through my cars dyno graphs..........suddenly realising that last year when Jerry fine tuned the car on the rollers he ran the dyno in shootout 8f...........so all you other C32 owners out there, mines not a freaky 406hp monster, it's actually the same as all...

The car was at Alan Jeffrey's this morning for a rolling road tune to set up the extra injector. Resulting in this... Apparently it's all about the torque :D

Sorry if this is dim, but how can I produce some very simple graphs?