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  1. CTown Duramax

    STELLAR Fuel Milage

    Hold on. I am not saying I get 35 mpg all the time. With our mix of bad city traffic and infrequent road trips, we are averaging 20.6 mpg over the last 5k miles. Probably 65% of engine hours are spent in traffic. Milage in bumper to bumper traffic is about 14mpg. It's exactly the same...
  2. CTown Duramax

    STELLAR Fuel Milage

    You can see the pic first above showing 33.6 for 170 miles, but I did not get a good picture of the read out this time, sorry. I made the return trip from the 65mph/35.1mpg run at normal speeds, cruise set at 75mph, accelerating above that a couple times and still got 30.1 mpg, so I don't...
  3. CTown Duramax

    2021 Tahoe LT Duramax 4WD at 1,100 Miles.

    Hi, I only get the crayon smell parking just after a regen cycle. And it's not bad either, nothing like the old days. This is a very easy diesel to live with and the low rpm big torque properties are terrific. The fuel efficiency is in line with an economy a sedan. Just got 35.1 mpg...
  4. CTown Duramax

    2021 Denali Diesel 3K miles engine and transmission issues

    It would be nice to have fewer chips and doodads. I do not like the sound of being locked in the car. No way out?
  5. CTown Duramax

    Cold Blooded Duramax?

    I am uncertain how much warm up to give this engine. I wait for the gauges to settle and then count twenty seconds before putting it in gear. The Owner's Manual Diesel Supplement p. 8 says "When the engine is cold, let it run for a few minutes before driving. This lets oil pressure build up...
  6. CTown Duramax

    "Remote Left in Vehicle" Message

    Thank you for the advice. I will reset by disconnectig the neg battery terminal and I'll replace the remote batteries. Interesting, but the problem just went away on its own. For a while, it was doing funny things like automatic function for the headlights/running lights was leaving the...
  7. CTown Duramax

    STELLAR Fuel Milage

    This is a wonder engine. Just got 35.1mpg going east to west on the same route with cruise control set at 65mph. Will post pic tomorrow and I'll do the math when I fill up to check on the DIC. I keep my tires at 37psi cold, so that helps mpg a little, handles better too. I don't mind going...
  8. CTown Duramax

    "Remote Left in Vehicle" Message

    good, thanks. Will do and report back later.
  9. CTown Duramax

    "Remote Left in Vehicle" Message

    2021 Tahoe - I am getting the "Remote Left in Vehicle" message when no remote is left in vehicle. I have experimented using one key taking it far away and then introducing the other, both keys in the car, turning off the message in settings, etc. Nothing seems to work. Any idea? I found...
  10. CTown Duramax

    STELLAR Fuel Milage

    I'd say drivers on the interstates here in Mass have been going five to ten mph slower since gas reached about $4.50 a gallon. The unofficial speed limit here is 80 mph. Troopers will stop you if you go over 80. I usually try to keep up with traffic. Then I get about 26-28, same as my last...
  11. CTown Duramax

    Yukon duramax production

    I don't know if this will work, but maybe you could do what I did. I used the Chevy locator and made diesel the only parameter. When I put in other parameters, things got screwed up. Use a ZIP code from Missouri, e.g., 64801 and set the search distance for 2,000 miles. There are 164 diesel...
  12. CTown Duramax

    Diesel and city driving?

    At 4,000 miles with 75% rush hour driving, everything is just fine. There have been no issues so far. Performance is tops. Fuel consumption is better than a v-6 Impala. Occasional regen cycles make no difference to daily short haul operation. If one is on the fence about getting a diesel, I...
  13. CTown Duramax

    Warmup and Idling

    Not offended - here for advice. Maybe I am wasting my money and should change oil at 5,000. This thing was expensive enough. When I was young, we changed our own oil every 3,000 miles., but tolerances and metallurgy have improved. I have never run a modern turbo diesel and am worried about...
  14. CTown Duramax

    Warmup and Idling

    I am new to diesel and to SUV's in general. This winter, we have been using our 2021 Tahoe LT Duramax LM2, our only car, to drive the kids to school two miles away. About 75% of our engine hours are spent idling in walking speed traffic. We go for a ten to 20 mile blast up the interstate to...
  15. CTown Duramax

    STELLAR Fuel Milage

    33.6 mpg on a 173 mile trip from sea level to 1,700 ft back down to sea level, up and down terrain, cruise control set to 65mph and drove 65mph the whole way, never below except to stop, speeding up to 72mph downhill, sunny, dry 37 deg F above freezing whole way. I was at 34mpg before getting...
  16. CTown Duramax

    D max and tire size??

    If you don't want to do it yourself, the dealer should be able to do it for you since GM sells 22 and 20 inch wheels for the Tahoe diesel.
  17. CTown Duramax

    noob diesel questions

    Just to add another perspective to this, we have a garage that stays just above freezing when it gets toward 0 deg F and have had no problems using regular year round fuel.
  18. CTown Duramax

    noob diesel questions

    Well, if I notice it's in regen, I keep driving. I think the manual supplement says to do this.
  19. CTown Duramax

    REGEN Light in DIC

    Is there supposed to be a warning light or some message in the information center about the engine going into regen? I checked the supplement, but it does not say specifically that there is a light for regen, only problems relating to the DEF. I think I can tell now from the exhaust note and...
  20. CTown Duramax

    noob diesel questions

    PS - I don't think any of the concerns you raise should stop you from getting this great engine. I drive our Duramax in very heavy traffic most of the time, no problems. If you go into regen in stop and go traffic, just keep driving until regen stops after you've gotten out of stop and go traffic.
  21. CTown Duramax

    0-20w oil

    I agree with Stbentoak. I am old enough to remember how cars used to be and they mostly sucked. Forget the warranty question, they were dangerous squeaky rust buckets billowing blue smoke after 50k miles - well, almost.
  22. CTown Duramax

    GM Stops Selling 3.0L Duramax Diesel Due To Supplier Shortage:

    Maybe this is helpful, dunno. I got lucky and found my Duramax at a dealer only 50 miles away. I used the Chevy website. I went on the website for tahoe and did an inventory search. After a few tries, I deleted all search parameters except diesel. I picked a ZIP Code in the center of the...
  23. CTown Duramax

    Diesel vibration in the seats in idle?

    My 2021 Tahoe LM2 3.0L has been running since 10/18/21 and perfect so far at 2,700 miles. It's a little louder in warm up and barely noticeable as a diesel after it reaches the 210F operating temperature. It has none of the clatter and sputtering associated with older diesels - think M-B 240D...
  24. CTown Duramax

    Duramax smell

    Do I have to drive on the higway for an effective regen cycle? When the engine goes into regen during rush hour, I go up and down a clear 25mph street until regen stops. If I have clear highway access, I use it.
  25. CTown Duramax

    2021 Duramax problem already

    My best 50 mile average was 36.3, my worst 12.7. I do a lot of driving in heavy traffic. Road trips average 26mpg driving aggressively or 30 mpg going 65-70 on cruise control. In city driving taking 1/2 hr to go 1.5 miles, I hve decided to run the autostop. Regen comes on more than once a...

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