My 94 chevy suburban is getting really bad gas mileage Does anyone know why?

[Jennifer]

Ok so I had all my fluids flushed and the oil changed and know my suburban is getting really bad gas mileage. Does anyone know why this could be and what I could do to fix it.
OK well i know that it is a suburban so dont tell me that. I am just saying it got pretty good gas mileage before it was serviced and know it doesnt.

[Jeremy S]

if your getting 14 to 16 your doing good its a big vehicle

[cpotuna]

its a suburban dude what do you expect stop being stupid and wasteing our time

[Glitch]

Getting worse gas mileage than normal means its time for a tune up..... have the sparkplugs, sparkpulg wires, distributor cap, air filter and ignition rotor replaced and you should see better gas mileage and have a smoother ride... best of luck.

[Marshall Summers]

Because it's a 94 chevy suburban. The average for that car is like 12mpg.