Major decrease in fuel econ with weather

[AndyWilde]

... anyone else experienced this? My fuel economy has dropped at least 20% (even on a clear trip with minimal traffic)

 

[Alan]

See here pal: http://www.cliosport.net/forum/showthread.php?t=474498&highlight=dense

 

[Cliotoby]

Mines increased from 21mpg to 23mpg.