Thought I’d add an update to this for anyone interested. We now have about 3100 miles on the new Duramax Tahoe and still love it. It gets lots of compliments and it’s still one of the only diesels I’ve seen around here (bragging rights). My best 50 mile mpg was 29.7 with about 1000 miles on the car. At 1k miles I switched it to the 450 mile average, which is holding around 26.5 - 27.5. With a full tank that’s about 675 mile range. In 3100 miles we are only down 1 bar of DEF, at that rate we should get 10k on a tank of DEF (no towing). It definitely likes 2 lane 40-60mph roads for fuel economy. We’ve taken it on a few short 1 hour highway trips and I’ve noticed cruising 75-80mph will decrease the mpg a bit to an average of 25 or so. If you’re someone who can keep it under 70, you could probably do much better.
Next problem, diesel is right around $6.00/gal around here; that hurts.
The only issue we’ve had so far is the rear lift gate button requiring two clicks. It happens every time the car sits overnight and probably half the time after than that. Kind of annoying and when it happens my wife looks at me like I’m the one who built the car. Clearly my fault.
Can’t say enough good about this powertrain setup. It feels so effortless like the motor never has to work, rpm doesn’t go above 2k in most situations.
Next, I see so many people penny pinching on the cost/benefit of the diesel. Really? This is at minimum a $65k car. If you can swing that, the couple hundred dollar difference each year in fuel +/- should be of no concern. That said, I think the 5.3 or 6.2 would beat the diesel in a flat out quarter mile but who is really using a Tahoe for that? Moral of the story? ORDER ONE you won’t be disappointed.
Here’s a link for the penny pinchers. My last Tahoe never did better than 18mpg on gas. If you go with 27mpg diesel, you start to save real money when diesel is within $1.00 of gas.
Calculate and compare the annual fuel cost for two different cars. Determine whether fuel economy savings is worth the cost.
calcnexus.com
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