sounds like my ride...i avg 14.5 mpg...now that i upgraded the overhead console...i am depressed reading that.
i do get 22 on highway...just alot of crappy city driving.

 

I think that's good. Mine usually hangs around there. just over halfway up to the 200 mark right? That's about where it should be.

 

Yeah just about. At least that's ruled out.

 

You've mentioned you have run the truck low enough on fuel to cause a stumble when stopping. The flat GM fuel tanks are poorly baffled, so a lot of sloshing occurs in the tank. Even with fuel starvation when stopping, there could be a gallon or more of fuel sloshing around in the tank, but it isn't staying near the fuel pump pickup.
Some GM vehicles are so bad, the fuel gauge will move up or down when accelerating or stopping.
Also, when my Blazer is sitting on empty ('94 w/20 gal. tank), it generally takes about 17 gal. to fill it (topped off). The sending unit is incapable of showing the last couple of gallons in the tank, especially when you have a wide, flat tank.

 

My 2002 is like that as well where it will show empty but only 16-17 gallons will fill her back up. Is it safe to say that if the sending unit cannot read the last couple gallons, the fuel pump will not be able to use that fuel either?

sorry if Im thread jacking

 

That's what I thought. And yes my fuel gauge is pretty bad lol. It does jump up and down on stops and heavy acceleration.

 

I average like 15.7 or something and about 70% of my driving is highway so your not getting to bad.

 

The fuel pump can siphon much more gas than the sending unit can read, but it never removes all the gas from the tank. The sending unit float bottoms on the tank before the tank runs dry.
I don't normally let my Blazer get below 1/4 tank, because the fuel pumps get hot when they are not submerged.

 

Do you know you gear ratio? my wifes 94 and my 96 both have 3:42 gears and we both get about 15-17 mpg. and both are 4x4's. these numbers are pretty close to our window stickers fuel rateing. you could be one of the few that has the 3:73 gears. just a thought.

 

Yeah, it seems like 3:73 gears hurt your mpg for sure, not sure if I really like the feel either, newer different blazer thou.