i have a 98 blazer 4.3ltr. 4x4, having rich running issues. i'm getting about 30-34 miles per 1/4 tank of gas. i've replaced: MAF sensor, Fuel Pump assembly, Temp sensor for computer, fuel filter, plugs, wires, cap rotor. it does however have a p1404 code. i replaced the EGR valve but the code came right back. so i returned the egr valve to the parts store. i've been a mechanic for years but my computer drivability trouble shooting is very limited. any advice would be greatful and i can answer any questions to the best of my knowledge to help get the gas milage back in par. i have a buddy with a 2wd s10 blazer and he gets 70 miles out of a 1/4 tank on highway and 52-60 in town.

 

random idea came to mind. What size tires are you running? gear ratio? Alot of people buy bigger tires for the 4x4 and then the gas mileage plummets. Ive noticed the 2nd gen 4x4 blazers suck on gas. My friends 97 gets 14 mpg with intake and exhaust done. My 91 tbi 4wd gets 17 city 20 highway. My dads 92 vortec gets 20 city,23 highway.

 

i dont have #'s but my blazer isnt the best on gas to. i think its due for a tune up. However, ive pretty much just accepted blazers arent the best for mpg.

 

my blazer dont suck much gas. I get 18 mpg city and 20 highway

today i towed a trailer with 2 lawnmowers 36 miles back and forth and i didn't even use a half tank

 

mine isnt horrible, i just think with some maintenance with could be alot better.

 

yea gotta stay on top of her i wish i could keep up with mines

 

I wouldn't use the gas gauge as a test of whether your getting good gas mileage or not. Depending on the make and model of what you're driving, the gas gauge can fool you. I've had some that will sit on full for over 100 miles and then drop like a rock. Others will drop quickly to 1/2 a tank and the go down slowly. The only sure way is to fill your tank and reset your trip odometer or write down your mileage. Next time you fill up, divide the miles ran by the # of gallons used to fill it again.

 

well i'm running stock size tires and gear ratio, can't imagine how bad it would be with bigger tires. can a TPS cause low fuel milage? i can put $10 or 2 &1/2 gallons of fuel in and by the digital odometer its only getting about 34-36 miles on that. which is about 1/4 tank. it's about 13-14 mpg in town. hell i got rid of a 94 bronco with a 5.8ltr. engine and it got 11 mpg, heck i thought these trucks got better milage than what i'm getting.

 

Consider yourself lucky, I can get 12 MPG around town IF I'm lucky. Usually about 11-11.5.

 

The type of tire, not the size, can make a big difference in your fuel mileage. From the photos I've seen here and on my own vehicle which I just bought a couple months ago, I've noticed that most have off road tread. This is great if you do a lot of off roading but if you're looking for better fuel economy then you'd be better off putting a set of all season radials on your ride. Off road tires not only require more power to get them to roll, they wear down much quicker when only used on paved roads. Another thing to consider if you have a 4WD is even if you don't have the 4X4 engaged, you are still expending power to turn the gears in the transfer case, something 2WD don't have to worry about. There are several other factors to consider too. Such things as the type of suspension you have, body aerodynamics, driving habit, ect.. I have never heard 1 person with a 4WD say they bought it because it gets great gas mileage. More often than not, they bought it as a toy.