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Old 12-10-2017, 08:55 PM   #301
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Yes I too found this thread helpful. Last week we sold our 08 Chevy Tahoe and we are waiting for our 18 GMC Sierra Denali to be delivered. I know there are some threads about covers for the bed, ours is a short box. I don't want a solid cover as I think I might use the bed to haul bulky stuff on occasion. Anyone here recommend anything?
Are all of you using premium fuel in your 6.2l engines?
I have used 87 octane for one tank as an evaluation and that worked fine. I wasn't towing and there was no audible knock. However, the power at brisk acceleration was less and I'm sure that the knock retard sensors were retarding the timing. I also felt like the gas mileage was less using 87 octane (I can only get 87 and 91 octane here in Wichita, KS. All the rest of the time, I've used 91 octane. This truck gets better mileage around town than my 2013 Jeep Grand Cherokee with the 5.7L Hemi, so I'm happy!
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Old 12-10-2017, 09:13 PM   #302
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I have used 87 octane for one tank as an evaluation and that worked fine. I wasn't towing and there was no audible knock. However, the power at brisk acceleration was less and I'm sure that the knock retard sensors were retarding the timing. I also felt like the gas mileage was less using 87 octane (I can only get 87 and 91 octane here in Wichita, KS. All the rest of the time, I've used 91 octane. This truck gets better mileage around town than my 2013 Jeep Grand Cherokee with the 5.7L Hemi, so I'm happy!
I should add that my tests were with 87, 89, and 91 octane. Sometimes I find 93, but 91 is very fine for towing. It is important to use TopTier fuel, most especially for any and all direct injected engines.
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Old 12-13-2017, 07:25 PM   #303
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Report on Chevy/GMC 1500 with 6.2 engine and Max tow pack

In case anyone is interested, I recently ordered a 2018 GMC Sierra SLT 1500 Crew Cab, Standard Box, 6.2 / 8 speed, 4x4, Max Tow. I ended up changing my mind. The payload is 1850. The MSRP is 59,000. Itís currently being offered for 44,000 and some change. The vehicle is available at Beck and Masten North in Houston. Ask for Ariel.
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Old 12-13-2017, 08:37 PM   #304
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In case anyone is interested, I recently ordered a 2018 GMC Sierra SLT 1500 Crew Cab, Standard Box, 6.2 / 8 speed, 4x4, Max Tow. I ended up changing my mind. The payload is 1850. The MSRP is 59,000. Itís currently being offered for 44,000 and some change. The vehicle is available at Beck and Masten North in Houston. Ask for Ariel.
Just curious as to why you changed your mind if you are will to share?

Thanks!
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Old 12-13-2017, 09:38 PM   #305
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Report on Chevy/GMC 1500 with 6.2 engine and Max tow pack

I have been driving a 2015 1500 SLT Crew Cab with max tow for the last Two years. Although I have 60,000 miles it has been the perfect TV. I decided that it made no sense to trade a vehicle that I have been perfectly happy with and is paid for. The increased horsepower and larger bed wasnít worth starting over.
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Old 12-14-2017, 02:09 AM   #306
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I have been driving a 2015 1500 SLT Crew Cab with max tow for the last Two years. Although I have 60,000 miles it has been the perfect TV. I decided that it made no sense to trade a vehicle that I have been perfectly happy with and is paid for. The increased horsepower and larger bed wasnít worth starting over.
60,000 miles is not even broken in yet. Good decision.
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Old 12-14-2017, 02:11 AM   #307
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I should add that my tests were with 87, 89, and 91 octane. Sometimes I find 93, but 91 is very fine for towing. It is important to use TopTier fuel, most especially for any and all direct injected engines.
I've been using 87 in my Ford 6.2 forever. Runs just fine. Just turned 115,000 miles. I'm planning to get a new one at 250,000.
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Old 12-14-2017, 05:52 AM   #308
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I've been using 87 in my Ford 6.2 forever. Runs just fine. Just turned 115,000 miles. I'm planning to get a new one at 250,000.
Is it a high compression engine? Does Ford recommend premium, like the ecoboost?
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Old 12-14-2017, 06:35 AM   #309
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Is it a high compression engine? Does Ford recommend premium, like the ecoboost?
87 minimum as far as I know. Our other car is an Ecoboost, gets regular too. Yes, both are high compression engines.

I've run 89 in my truck but after many tankfuls there is absolutely no difference in mileage or performance and 87 saves thousands of dollars a year as much as I drive.
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Old 12-14-2017, 08:30 AM   #310
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87 minimum as far as I know. Our other car is an Ecoboost, gets regular too. Yes, both are high compression engines.

I've run 89 in my truck but after many tankfuls there is absolutely no difference in mileage or performance and 87 saves thousands of dollars a year as much as I drive.
OK, I did a quick Google check, and I know some of these compression ratios do change periodically (like the 3.5 Ecoboost going from 10:1 to 10.5:1), but I would not consider the Ford 6.2L to be high compression ratio.

Ford 6.2L = 9.8:1
Ford 3.5 Ecoboost = 10.5:1 (of course a turbo)
GM 6.2L = 11.5:1

Thus the reason the Ford 6.2L recommends 87 octane, Ecoboost and GM 6.2L recommend premium.
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Old 12-14-2017, 09:11 AM   #311
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I didn’t know this thread existed.

The lease was up on my 2015 Silverado LT with the 5.3 and the max tow package. I traded it for a 2018 Sierra 1500 Denali 6.2. No max tow package or trailering mirrors available on the 1500 Denali. I bought the chrome trailering mirrors and will install them this weekend. The stock mirrors seem so small after using the big mirrors for the last 3 years.

I took about a 400lb hit on the payload but this truck rides much better. I only tow about 10% of the time so I’m fine with the softer suspension. My ‘71 Sovereign is lighter than the newer trailers so I’m okay there. I travel solo so I never use all the payload anyway. I only have 300 miles on the truck so far but this 6.2 has great power. It seems quieter but that may be the Denali trim level.

I bought a vinyl folding bed cover for the Silverado on Amazon. I think it was $220. It has great reviews and works fine. Now it sits on the 2018.
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Old 12-14-2017, 03:08 PM   #312
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OK, I did a quick Google check, and I know some of these compression ratios do change periodically (like the 3.5 Ecoboost going from 10:1 to 10.5:1), but I would not consider the Ford 6.2L to be high compression ratio.

Ford 6.2L = 9.8:1
Ford 3.5 Ecoboost = 10.5:1 (of course a turbo)
GM 6.2L = 11.5:1

Thus the reason the Ford 6.2L recommends 87 octane, Ecoboost and GM 6.2L recommend premium.
9.8 is low, 10.5 is high? Hmmmm.... my old flathead was 7.5:1 so I guess it's all relative. Glad I don't have to pi$$ my money away on premium to get 20 more horsepower.
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Old 12-14-2017, 03:17 PM   #313
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9.8 is low, 10.5 is high? Hmmmm.... my old flathead was 7.5:1 so I guess it's all relative. Glad I don't have to pi$$ my money away on premium to get 20 more horsepower.
10.5 is "moderate" in my book, but it is a turbo. Rules are different than naturally aspirated, as combustion pressures are much more highly variable.

Don't have to &*@! any money away. Can't speak for the Ecoboost, but the GM 6.2L gas experiment is listed in my post above. Premium is "recommended" per the owner manual, not required.
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Old 12-15-2017, 03:31 PM   #314
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I donít know if this was covered but, Iíll ask.
Do I have to connect any wires under the hood for battery charge capability? Iíll presume that the brake controller built in the dash is working and all I have to do is plug our Airstream and go? We will pick our truck up later today. They said it was in.
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Old 12-15-2017, 03:36 PM   #315
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Your 7 pin connector should be fully operational upon delivery (including the trailer). You can backup to your trailer and try it out soon. You should drive 500 miles for normal break-in before towing.
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Old 12-15-2017, 03:41 PM   #316
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Your 7 pin connector should be fully operational upon delivery (including the trailer brake controller). You can backup to your trailer and try it out soon. You should drive 500 miles for normal break-in before towing.
....
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Old 12-15-2017, 03:54 PM   #317
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9.8 is low, 10.5 is high? Hmmmm.... my old flathead was 7.5:1 so I guess it's all relative. Glad I don't have to pi$$ my money away on premium to get 20 more horsepower.
Well, if you run Death Valley, a tow vehicle is better off with premium. Over Loveland Pass, it won’t matter. Any TV.

Prior to FI, about the maximum CR for a tow vehicle was a confirmed 8.75:1 with tight quench. Not what you’d find in a factory tow or truck motor, it would have been 7.5:1 or so what with the degradation of gasoline quality since the 1960s, not just lead removal and lower octane. 8.5:1 was about it for all but Corvettes and the like for a couple of decades.

A tow motor really is all about cylinder pressure. Maintenance thereof. It’s harder duty than racing. Spark control is everything above the mentioned CR numbers. Using premium hardly a burden for the lesser percentage of annual tow miles.

The last V8-440 I had (1990s) was tuned for premium by me. The extra mpg paid off as i ran it hotter than stock and with a faster advance curve. Plenty of details to have sorted to be able to do that.

When the computer de-rates engine power, fuel will be seen to have been cheap.

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Old 12-15-2017, 04:02 PM   #318
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I run Detroit, not Death Valley. I need all the power I can get!
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Old 12-18-2017, 07:24 AM   #319
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We picked our truck up yesterday
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Old 12-18-2017, 08:12 AM   #320
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Congratulations...It looks great! I strongly recomend that you add the GM Towing Mirrors.
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