Hi everyone i am new here and have a question. My blazer is a 94 6 cylinder engine, four door. The fuel consumption on my car is irregular, at times i can get close to 300 miles per full tank and other times about 200. Is there anything that can explain such erratic behavior or is it the gas brand i use? When i first noticed i thought it was because of the arco gasoline i used, so i changed and my mileage went up now i use anything but arco and my mileage is going down again.

 

welcome to the site, when was your last tune up?

 

it was about two months ago

 

did you use ac-delco plugs? also did you change out the fuel and air filter with the tune up?

 

welcome welcome i have nothing to say about repairs or mods lol

 

Welcome to the gas guzzling Blazer world! If you get good milage let me know, I also want some. LOL At least you guys have got cheap gas!

 

Welocme! Interrmittent issues are always the toughest to figure out. I have owned two vehicles that had bad fuel economy issues and both times there was a leak in the fuel supply system. Not saying thats your issue but worth looking at.

 

Miles per tank is actually a pretty useless way of looking at fuel usage. Do a miles per gallon computation over ~4 tankfuls and give us the figure.