D20284: Fix l/100 km to MPG conversion

[Michal Malý]

madcatx created this revision.
madcatx added a reviewer: broulik.
Herald added a project: Frameworks.
Herald added a subscriber: kde-frameworks-devel.
madcatx requested review of this revision.

REVISION SUMMARY
  Previous code (probably) worked only for l/100 km -> MPG but not the other way around. Fix this by using reciprocal conversion when necessary.
  
  Output:
  38.7 MPG -> 6.077 l/100 km; 16.455 km/l; 46.482 MPGI
  16.455 km/l -> 6.077 l/100 km; 38.7 MPG
  46.48 MPGI -> 6.077 l/100 km
  
  Seems good to me.
  
  Fixes bug 378967

REPOSITORY
  R292 KUnitConversion

REVISION DETAIL
  https://phabricator.kde.org/D20284

AFFECTED FILES
  src/fuel_efficiency.cpp

To: madcatx, broulik
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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