• Arranging all tank MPGs in order, then selecting the middle number yields the median.
• Mode is the most frequently occurring MPG value.
• Standard Deviation indicates how much variation exists among the various tank MPGs.
  
  

• Entries begin with a date. The current year is only shown in early January.
• Next is a two letter code for fuel brand. Most are obvious, such as Ex for Exxon. A full list appears below.
• An "m" after the two letter fuel brand code means maintenance was performed.
• Next is a few characters of driving summary. ML is mostly local, ad=average driving, M495 is low traffic highway, and MLT is mostly low traffic on regular roads. It isn't case sensitive.
  
  

Am = Amoco       Ar = Arco        Bp = Br. Pet    Ch = Chevron
Ci = Citgo       Co = Co-op       Cr = Crown      De = Default
Dv = D'ville, 214/424             Et = Etna       Ex = Exxon
Fr = Freestate   Ge = Getty       Gu = Gulf       He = Hess
Me = Merit       Mo = Mobil       Ph = Phillips   Se = 7-11
Sh = Shell       St = Steuart     Su = Sunoco     Sz = Sheetz
Te = Texaco      Un = Union 76    Vn = Van Ness   Wa = Wawa
Xt = Xtra