GM Mileage 6.6 gas & Diesel
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โFeb-15-2022 10:48 AM
2007 Chevrolet 2500HD 6.0L
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โMar-19-2022 10:27 AM
1972 or 2022 changes nothing.
If the tow vehicle (with scaled weights) over the same road course at the same speed gets 16-mpg solo, itโll see 7.8-9.6/mpg while towing. (Take that to the bank).
An aero TT with details worked will stay under 40%. A box TT (slides, etc) with typically sloppy hitch rigging can (will) exceed 50%.
If it matters then SAFETY LONGEVITY RELIABILITY ECONOMY will be given the attention they deserve. They track together 90% of the way.
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1990 35โ Silver Streak
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โMar-19-2022 10:22 AM
valhalla360 wrote:BackOfThePack wrote:
When diesel costs $4.25/gl and gasoline runs $2.80/gl the fuel economy is the same.
16-mpg diesel and 10.5-mpg gasser.
1). Figure miles owned in advance. Add diesel premium to needed differential (and insurance plus maintenance, etc).
Diesel equivalent hasnโt been cheaper since 2007.
There are some wacky numbers on this thread.
- 2mpg...maybe if you are climbing an 8% grade and try to keep up at 75mph...but over 50-100miles, it would be almost unheard of and in mountains, there is typically a downhill to go with every uphill.
- Diesel typically get's 20-40% better MPG (and 40% is unuusal). 52% improvement strains credibility.
For general planning purposes, figure somewhere on the order of 7-12mpg.
Biggest issue is driving style.
- Slow down a bit often will generate significant MPG improvements.
- If in hilly, let gravity speed you up on the downhill and then let a little speed bleed off on the uphill (assuming you aren't in a congested area disrupting traffic).
- Doesn't work for weekenders (or if you have a weeks vacation) but we've actually changed travel days based on wind projections. Going from a 30mph headwind to a 10mph tailwind has a pretty massive impact. At 60mph, the engine feels 90mph vs 50mph loads, since the bulk of the power is fighting wind resistance.
At $4.25/gl diesel, a diesel pickup getting 16-mpg is the same mpg COST as a gasser at 10.5/mpg where the energetic content is reflected by price (BEFORE the price of the Diesel engine option).
Thereโs no reduction in EXPENSE PER MILE until fuel prices are normalized and extra-cost engine is figured. (Write a business plan).
A diesel IS NOT a more economical engine to operate for Joe Sixpack. That disappeared in 2007 until which time diesel was CHEAPER per gallon.
1990 35โ Silver Streak
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โMar-19-2022 10:17 AM
Grit dog wrote:BackOfThePack wrote:
When diesel costs $4.25/gl and gasoline runs $2.80/gl the fuel economy is the same.
16-mpg diesel and 10.5-mpg gasser.
1). Figure miles owned in advance. Add diesel premium to needed differential (and insurance plus maintenance, etc).
Diesel equivalent hasnโt been cheaper since 2007.
And yet where you live the 2 fuels are about the same price. And generally are within about 10% of each other everywhere, not the 50% difference to embellish your point.
At THAT price the MPG is equal.
1990 35โ Silver Streak
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โMar-15-2022 12:07 AM
BackOfThePack wrote:
When diesel costs $4.25/gl and gasoline runs $2.80/gl the fuel economy is the same.
16-mpg diesel and 10.5-mpg gasser.
1). Figure miles owned in advance. Add diesel premium to needed differential (and insurance plus maintenance, etc).
Diesel equivalent hasnโt been cheaper since 2007.
There are some wacky numbers on this thread.
- 2mpg...maybe if you are climbing an 8% grade and try to keep up at 75mph...but over 50-100miles, it would be almost unheard of and in mountains, there is typically a downhill to go with every uphill.
- Diesel typically get's 20-40% better MPG (and 40% is unuusal). 52% improvement strains credibility.
For general planning purposes, figure somewhere on the order of 7-12mpg.
Biggest issue is driving style.
- Slow down a bit often will generate significant MPG improvements.
- If in hilly, let gravity speed you up on the downhill and then let a little speed bleed off on the uphill (assuming you aren't in a congested area disrupting traffic).
- Doesn't work for weekenders (or if you have a weeks vacation) but we've actually changed travel days based on wind projections. Going from a 30mph headwind to a 10mph tailwind has a pretty massive impact. At 60mph, the engine feels 90mph vs 50mph loads, since the bulk of the power is fighting wind resistance.
Ford F250 V10
2021 Gray Wolf
Gemini Catamaran 34'
Full Time spliting time between boat and RV
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โMar-14-2022 12:52 PM
Also, currently in Western WA, Diesel is almost $1.00 more per gallon over gas. There is no reason for that, Diesel should be cheaper.
Get what gets the job done the best and has your future in mind. If you buy for todays gas prices, you will be looking for something else when gas prices normalize.
On edit - you mention you plan to get a 3/4 ton when they become more readily available - so your a few years out...
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โMar-14-2022 11:21 AM
BackOfThePack wrote:
When diesel costs $4.25/gl and gasoline runs $2.80/gl the fuel economy is the same.
16-mpg diesel and 10.5-mpg gasser.
1). Figure miles owned in advance. Add diesel premium to needed differential (and insurance plus maintenance, etc).
Diesel equivalent hasnโt been cheaper since 2007.
And yet where you live the 2 fuels are about the same price. And generally are within about 10% of each other everywhere, not the 50% difference to embellish your point.
2017 Heartland Torque T29 - Sold.
Couple of Arctic Fox TCs - Sold
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โMar-14-2022 11:05 AM
I've turned that money into my "camping and recreation fund" savings account.
The money from that account goes towards fuel for my vacations and camping trips.
Because that money sits there and isn't used for anything else, it's not a huge hit to my main bank account to go camping.
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โMar-02-2022 04:40 AM
The tow vehicle is a tool that has a job to do. Let it do its job and don't be concerned with what it costs to get the job done.
I've had a 2008 Duramax since the truck was new. I've hauled 3 TTs and two truck campers with it.
MPG runs 10.5-12 hand calculated.
2018 Arctic Fox 992 with an Onan 2500i "quiet" model generator
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โFeb-25-2022 02:40 PM
2005 Trail Cruiser TC26QBC
1965 CHEVY VAN, 292 "Big Block 6" (will still tow)
2008 HHR
L(Larry)V(Vicki)J(Jennifer)J(Jesse)J(Jason)
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โFeb-17-2022 01:02 PM
As for mileage can't comment on the 6.6 Gas, but our 2015 duramax gets 10-12 towing our 35ft TT, long flat freeway I can get 12, Rocky mountains in the 9-10 range. we usually tow at 65 on the freeway (except CA) and 55-60 on backroad highways. Non towing is where the Duramax really does well. We consistently get 18-20 hand calculated traveling between OR and central MT running the speed limit + 5 or so. MT and Idaho has lots of freeway with 75 and 80mph speed limits.
When picking and choosing between gas and diesel, economy really didn't play into my decision, it was which engine would I like driving the best when towing and empty.
2004 14' bikehauler with full living quarters
2015.5 Denali 4x4 CC/SB Duramax/Allison
2004.5 Silverado 4x4 CC/SB Duramax/Allison passed on to our Son!
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โFeb-17-2022 12:44 PM
16-mpg diesel and 10.5-mpg gasser.
1). Figure miles owned in advance. Add diesel premium to needed differential (and insurance plus maintenance, etc).
Diesel equivalent hasnโt been cheaper since 2007.
1990 35โ Silver Streak
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โFeb-17-2022 09:28 AM
Grit dog wrote:
OP, great question, but at the end of the responses, you wonโt have any succinct info anyways. There are just too many variables, not the least of which is the owners โperceptionโ of their mileage.
Factor in everything else to make your decision, imo. Diesel will be about what is expected at 20-30% better mileage if comparing apples to apples.
If gas is getting 8 mpg, 25% better is 10mpg. I got 9.9 in 2020 hauling my trailer to/from Kansas with a CC Dually Dmax.
I got 9 in 2021 hauling my trailer to/from Iowa with a Express 6.0. I stayed off the interstate on the trip home. I added a wind deflector (that was a $20 used purchase) that seemed to help.
Wife
Employee of GM, all opinions are my own!
2017 Express Ext 3500 (Code named "BIGGER ED" by daughters)
2011 Jayco Jayflight G2 32BHDS
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โFeb-16-2022 09:26 AM
Jayco23FB wrote:Sjm9911 wrote:
Im going to go here again, you can look up previous posts. 9 to 14 towing depending on speed and terrain. Around 13 at say 60 mph, 65 to 75 will be 10 to 12 or a bit more. I usally will go faster. I think I got 13 avrage to disney from nj at like 65 mph. 13 to 16 not towing on the same principle. I get 15 ish at 65-70. And 14 to 13 at say 80. I have 26000 miles on my 2020 2500 double cab? With reguler bed lt 4x4. Half of that or more towing. TT is about the same weight. I do load up the bed with lots of junk and use the bed outlet while towing. Pros, bigger gas tank, less stops. Trips that I had to stop 3 times for fule with the 1500 can be made on one fill up. This is because larger fule capacity and a little better fuel economy on the newer truck. Not much difference in towing vs not towing with a 5500 lb TT. Maybe 1 to 2 mpg less.
Duramax?
6.6 gasoline single rear axel.
2020 Silverado 2500
Equalizer ( because i have it)
Formerly a pup owner.
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โFeb-16-2022 08:13 AM
Factor in everything else to make your decision, imo. Diesel will be about what is expected at 20-30% better mileage if comparing apples to apples.
2017 Heartland Torque T29 - Sold.
Couple of Arctic Fox TCs - Sold