I have taken this trip several times and I have never gotten over 21 mpg either direction with with 93. Most of the time it will be around 19.5-20.5 mpg. I usually go to the lake about once or twice a month. This is the first time I have used non-ethanol.
My service engine light came on last Thursday afternoon so I figured I would try and experiment and it worked this time. I went to the lake and this town doesn't have high octane gas because most stations have non-ethanol in the place on 93 octane. After running non-ethanol for about 50 miles my service engine light cut off. Last Friday I cleared my trip calculator and went out of town (168 miles) and got 20.8 mpg on 93 octane. I waited until my low fuel light came on and filled up with 90 octane non-ethanol. I cleared my trip calculator again drove the same route (168 miles) home and got 22.6 mpg.
I got my truck back today and it costed me $384 after I talked to customer care and the dealer. The dealer said they came to agreement with GM that I had to pay 40% of the total bill. I didn't see the actual total to calculate the 40% so who knows. Here is the new window part number that they waited on. The window was built 7/29/20. The dealer said this was a new part number but I don't know. Maybe sooner one on here can tell me.
The dealership has a body shop doing the repair and they are waiting on the new window. The dealership said gm has a new part number window that just came out. The window should be in and installed today and I will pick it up Monday afternoon. Here is a picture of the truck. They didn't take the rear window spoiler off. The dealership also said they were going to ask GM to cover it under warranty. I have already called GM customer service and I have a case number for this.
I got my 2019 HC in October of 2018 and my rear window started leaking last Friday (8/7/2020). I called the dealer as soon as I saw the water and I told them I had 36,8xx miles. I dropped it off Monday (8/10/2020) with 36,9xx miles and the dealer said that warranty will not cover the cost since I'm over my 36,000 mile bumper to bumper coverage. A service bulletin came out in February 2019 but since mine never leaked I didn't want them touching it. Am I wrong for saying that warranty should cover it since it is a known problem? Update: I called and the seal was cracked and the rear window is separating. They are replacing the rear window and seals.
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