My experience on poor engine performance caused high fuel consumption was
about the ignition cables. This idle rpm was ok but not so smooth and got
the black smoke when pressing acceleration pedal down. I changed all of
ignition cables(coil to distributor and distributor to spark plugs) and
finally obtained pretty good consumption rate.

Before leak test on fuel tank or change something, try checking the fuel gas
cap first.

Hope this may help,

Chayan Srisawat
'89 Syncro and '72 Bus
Rayong, Thailand

[text/html]