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MPG for DIESELS

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by chevy4x4, Jul 25, 2000.

  1. chevy4x4

    chevy4x4 1/2 ton status

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    Ok, I've been getting totally different answers every time I ask someone. Would a stock 6.2l diesel blazer with 4:10s and 38s get around 15-20 mpg? Same question but replace 38s with 35s. I asked one person about the 38s and they said around 20 and another said around 10. I know that not all engines get the same mpg, but I don't think there should be such a big difference. Diesel owners, how many mpg do you get?

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  2. 6.2Blazer

    6.2Blazer 1/2 ton status

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    I have a '90 with a basically stock 6.2 (only mod is free-flowing mufflers), 4.10 gears, 700r4 trans (with O/D), and 35x12.50 radials. The 4.10's are just about right with the 35's and the diesel when it comes to cruising rpm and I estimate that I get around 18-20 mpg during combined freeway and city/country road driving. I think the mileage would go down a little with 38's since the engine would be out of it's optimum powerband (causing it to lug on the highway) with the 4.10 gears and the extra weight and rolling resistance of the larger tires would also decrease mileage some.
     
  3. chevy4x4

    chevy4x4 1/2 ton status

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  4. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    6.2 answered your question, that's why I never bothered. But since you asked again, you should expect to get 20 mpg average with your 6.2. I also agree that 35s would be a better match for the diesel's output.
     
  5. 6.2 man

    6.2 man 1/2 ton status Premium Member

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    I get between 20 and 19 MPG . I have stock gear ratio 3:73 s? and stock tires and wheels .
     

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