why is my 91 gmc jimmy using so much gas?

[determineddamzil]

cutting out also varnish in my throttlebody

 

[pjhj2006]

Try these gas saving tips. They'll make a difference. If not, it's running too rich OR you have a leak in your fuel lines OR your fuel gauge is malfunctioning.

http://www.all-about-car-selection.com/fuel-economy.html