my step dad filed the injectors to make a wider spray in his jeep and now he gets close to 30mpg...he told me some other stuff he tuned also like the intake...idk if there are any tricks like this but if ur blazer is fuel injected and not TBI then try it out...gotta do mine soon

 

Wish I was paying $4 per gall we pay twice as much £5.22 = $9.43

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around $1.55 here in kentucky
my blazer gets around 17
but i drive alot around town
can someone post a pic of the overhead Mpg meter or whatever it is

 

i bought a flowmaster 40 series delta flow exhaust (about $120) and it almost doubled my mileage
it wasnt hard to install and after you drive it for about a week and a half you start to break it in and you get a much deeper louder tone if you would also want that

 

I'm sorry, but a simple exhaust upgrade on any vehicle will come no where close to "doubling gas mileage"max gains might be in the 3mpgs but that's more so on the heavy diesel side of things. I call complete B.S. on this one!

 

I had 15mpg before I put a CAI and Flowmaster 40 series on my Blazer, and even after those upgrades it's still 15. Now with gas looking as if it's heading towards $1 per gallon, I don't mind if I was driving a tank.