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Which motor are they putting in? LM2 or LZO?

I use the meters on truck to give me a general sense of how efficient I'm driving. I hand calculate every tank when I fill up. I have the Elevation trim, Crew Cab with standard 6' 7" bed. 3.23 gear ratio, tires are 275/60R20.

They are close but I would expect it to be different since driving conditions can change throughout the month. It will depend on how much driving you do. Around home, I only fill up about twice a month. On road-trips, it'll be more of course. Weather can have a big impact also. I'm noticing...

I have two trip meters. One I reset every month. The other is reset when I fill up. I hand calculate and found it's fairly accurate compared to the trip meters. I also reset my 50 mile meters every fill up.

Which tire did you switch to?

My Sierra 1500 with LZO came with Bridgestone tires. I noticed at freeway speeds, a more bumpy or slight vibration. I increased the tire pressure from 35lbs to 39lbs which seemed to help a little. I'm not totally sure whether it's just the tires or the shocks or a combination of both. Any...

Best tank of fuel mpg was 33.6 during a road trip to Spokane.

The only true way to calculate accurate MPG is miles driven divided by gallons used. The various dash readouts are good for providing a general sense of efficiency. I track my mpg on every tank religiously by using the Fuelly app to track trends and to also make notes of driving conditions I...

I have the same color! Congrats on the new ride!

Just did a road trip to Spokane and back and didn't notice any shudder or shaking at those speeds. I did notice it being a little bouncy at 70 mph. It's probably the tires. Goin to try and sort that out by rebalancing and maybe a little more air.

Late to the party. I don't have the max towing. Payload capacity is 1600 lb.

I may re-think or change what I use for fuel treatment. I noticed that the stations where I live have switched to 100% renewable diesel. I've read good things about the fuel vs bio-diesel and diesel #2. Seems adding a cetane booster is overkill. But still concerned about lubricity.

I've had diesels before and always used additives. With nothing but biodiesel available where I live, I currently use Opti-Lube XPD. It makes a difference IMO. Seems to run smoother and quieter, even during regens.

My Sierra 1500 loves the open road. In town driving, not so much.

I'm loving the MPG so far. Haven't taken a road trip yet but will be heading up to Spokane in another week.

Did you ever figure out what was causing the vibration?