Mine is a 98 4X4 with the 4.3 and I average between 18 and 20 depending on my trips. I use cruise control as much as I can.

 

The last couple of tanks I had sucked. I'm getting my "winter" gas mileage again. It's between 10 and 13 MPGs in my 95 Jimmy.

 

16.5 mpg average. I do about 70% city, 30% highway.

 

Let's see, 1989 Sport, 4.3v6 (bored.60 over) Auto tranny, everything else is stock. Tires are stock 235x75x15. I drive all the time, mostly in town not much freeway, I typically average between 18-21 mpg.

 

I just took a long trip, all highway ate 73 mph, all stock blazer with load (cloths, computer, wreaths...) and averaged around 20 mpg

 

glad to say im one of the 8 people gettting 10-11, NOT. 31A/T's, k/n intake, custom exhaust with highflow cat.

new cap, rotor, plugs, and wires comming up very soon as my 4.3 has been running very sad lately

 

man i dont know whats wrong with your guys trucks 2002 blazer 4dr 4x4 3.42 AEM Brute force b&m shift kit and 2400 stall, with a poweraid TBS, and dont forget the superchips micro tuner, oh and befor i for get elec fans with a comp cam and mallarie ignition, 31in street tires with 2 in body gettin 26 for the past 3 years i have also never used any thing but BP high octain

 

I've got a 97 4dr 4x4 all stock. 4.3l usually just short stop and go trips with crap regular gas getting about 16 mpg.

 

97 back road and city driving 17. If i baby it can get 20. pull anything and its 12

 

i typically get around 16-18 mpg. all stock 4.3, stock trans and gears. mix of driving. pretty easy on the gas most of the time. i run 87 in it. however we went to arkansas last month and i got 18mpg on the interstate with the inside full of stuff and 20mpg on the way back with the cruise set pretty much the whole way 65-70 mph.