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I have a 1999 1500 with the 5.9. im getting about 13.5mpg. I am thinking about going diesel. I found a 99 with a diesel and wondering if I should go that route or stay where im at? If I do go diesel, is their anything I should look at in particular? It has 214k miles with an automatic. I drive about 100 miles round trip a day. Thanks For the help. Chris
 

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Watch out for the early 24v, the "53" block had cracking problems. I would say go diesel but I'm kinda biased. The automatics unless built will fail with any extra power thrown at them. You can get a tuner for the 24v that will get you a little better mileage. I've seen 24mpg from a 24v with a 6 speed manual, it was also 500hp. My truck gets 28mpg at 65 mph, but its a half ton with a 12v in it. The old magnums are gas pigs.
 

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if the block hasn't cracked by now it should be good to go, some were rpaired or rplaced by cummins. the trans may be an issue but was most likely rebuilt at around 100000 miles. if the rest of the truck is in good shape, go for it.
 

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Stay with the gas, diesel is more expensive at the pump and repaires are also more expensive. If you where updating to a newer diesel that has crazy hp and torque I would say its a win but 99"s where not powerhouses like the HO engines of today
 
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