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About to buy a 2001 HD with the 8.1


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I am just about to buy a 2001 Chevrolet 2500HD 4x4 with the 8.1L from a local dealer and i was just curious about the gas mileage and reliability of this engine. The thought of having an actual big block seems pretty cool with the few that are still around. I test drove it today and the power of it was amazing. It seemed to run at real low rpms and I was just curious exactly what the mileage was but the dealers usually don't tell you the exact mileage so instead of asking them I wanted to leave a post on here.

Thanks in advance

Rich

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The only common problem with that engine will be the crank sensor. You'll have to replace it soon if it hasn't been done already. I got mine with 52K on it and did a tune up soon thereafter. It's been running like a top ever since. I do mostly city driving and get 10.0, on the highway I'll run fast but still manage 11. You never get over the power, it feels as good as it ever did when I have to go.

 

Vernon

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  • 2 weeks later...

My 70K mile, 2K1, 8.1, CC, SB gets 12-13 avg hiway and 10-11 in town. significantly less towing a 28' enclosed trailer loaded with 9000lbs of race car and associated gear.

 

It also gets about 1 qt of oil for every 1500 miles.

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The only common problem with that engine will be the crank sensor.  You'll have to replace it soon if it hasn't been done already.  I got mine with 52K on it and did a tune up soon thereafter.  It's been running like a top ever since.  I do mostly city driving and get 10.0, on the highway I'll run fast but still manage 11.  You never get over the power, it feels as good as it ever did when I have to go.

 

Vernon

 

 

 

 

Why do you say that it needs to be replaced? Mine was never done..

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