What gas do you use in you 2014 gmc sierra?

[Ventilator]

Haha! Yeah, I am baffled by some of these mileage figures. I'm extremely easy on the gas pedal and I'm averaging 17.0 combined city/highway (one MPG better than my '13 LT was doing). Best I've ever done for a 50 mile stretch ALL highway was 20.0 (with a tailwind)

 

Unless they are doing all highway cruising at 55mph??? I don't even know if I could do those numbers doing 55!

 

To stay on topic... 5.3L running 87 octane.

 

 

Comparing two very different vehicles.

 

You have a Crew Cab Silverado LTZ with 22" wheels, lift/level, molded mudflaps, power steps, and several other goodies. All things I don't have. And IMO, all things that do not help in the gas mileage department.

 

I have a Double Cab Sierra SLE with 18" wheels, no lift/level, no molded mud flaps, not too many other goodies. IMO the Sierra with it's contoured front end is more aerodynamic than the Silverado, and the air dam is different in design as well.

 

Your Crew Cabs and several components were built in a totally different location than the Double Cabs and some components, at different times as well.

 

These trucks will get better gas mileage when they are well broken in. Mine didn't switch in to the V4 mode nearly as much for the first couple thousand miles. Would not stay in the V4 mode on the expressway over 62 MPH either for the fist 1500 miles or so. Now it will stay in V4 up to at least 75 MPH as long as it is not going up a hill or hitting a strong headwind.

 

I do get better gas mileage heading East in the afternoon with the prevailing wind than I do in the mornings heading West into the prevailing winds. Everything is up to operating temp faster in the afternoon as well.

 

Not all gas is created equally, either. Only use Top Tier here.

[Luster]

 

 

Comparing two very different vehicles.

 

You have a Crew Cab Silverado LTZ with 22" wheels, lift/level, molded mudflaps, power steps, and several other goodies. All things I don't have. And IMO, all things that do not help in the gas mileage department.

 

I have a Double Cab Sierra SLE with 18" wheels, no lift/level, no molded mud flaps, not too many other goodies. IMO the Sierra with it's contoured front end is more aerodynamic than the Silverado, and the air dam is different in design as well.

 

Your Crew Cabs and several components were built in a totally different location than the Double Cabs and some components, at different times as well.

 

These trucks will get better gas mileage when they are well broken in. Mine didn't switch in to the V4 mode nearly as much for the first couple thousand miles. Would not stay in the V4 mode on the expressway over 62 MPH either for the fist 1500 miles or so. Now it will stay in V4 up to at least 75 MPH as long as it is not going up a hill or hitting a strong headwind.

 

I do get better gas mileage heading East in the afternoon with the prevailing wind than I do in the mornings heading West into the prevailing winds. Everything is up to operating temp faster in the afternoon as well.

 

Not all gas is created equally, either. Only use Top Tier here.

True...

[KARNUT]

When I found out the there was HP to be gain running E85 it was a no brainer for me. I was running 93 anyway cause I notice a improvement in performance. When I switch to E85 I notice that too, only loss 3 miles per gallon in town.

[CorvetteOJ]

I use 93 in my 6.2, but I have always used 93 regardless of motor. Then, only Chevron, BP, or in emergencies, Shell. I still remember in '63, as a senior in high school, I had a '57 Ford with a 292 and used only "high test" Amoco. It was the only "white gas" on the market and as teenagers we thought it was the magic elixir. That's how I got married to PB (used to be Amoco). Then in the mid 80's I began owning Mercedes and all the gurus, technicians, and factory reps were constantly recommending Chevron due to the "techron" added. I began using it and could tell the difference when I did, over a period of time. That's how I got married to Chevron. In addition, I have owned Vettes since '97 and always used Chevron or BP only. I have never had any fuel transfer problems that are common with the C5 and C6 vettes.

 

I have heard every story imaginable from everyone imaginable, including petroleum engineers concerning the mythical advantages of using 93 octane. I have never wavered and will always use 93. Back in the day, we didn't talk 93 or 87...it was always "high test" or "regular." I'm sure there are many others on here who can relate to that. I eventually was forced to start using the 93 octance term because it got to the point where younger generations, in their 30s and 40s didn't understand what I meant by "high test."

 

Just thought I would share some personal history to provide the whole story because very few folks are as eccentric as I am about the fuel I use. I don't buy fuel for gas mileage and I don't drive to preserve it. At 68 my right foot is still as heavy as it was at 21, maybe more so if I remember correctly. Besides, the 6.2 sounds awfully good!

[SlavO]

87 Exxon or Shell 5.3 with 3.42 CC Those are awesome numbers you double cabs are getting

 

It's really 17.4 ;)

[Luster]

87 Exxon or Shell 5.3 with 3.42 CC Those are awesome numbers you double cabs are getting

 

It's really 17.4 ;)

 

Almost exactly my same numbers.

[gmissed]

87 Exxon or Shell 5.3 with 3.42 CC Those are awesome numbers you double cabs are getting

 

It's really 17.4 ;)

My MPG number exactly at 5K.

[Mike1220]

 

 

It's a Double Cab GMC Thing! I think?

 

The numbers don't always jive at the pumps when I fill up the tank. They have been slightly better, and as much as 1/2 MPG worse for the overall. That is not always an exact science either, because some pumps shut off earlier than others.

 

 

 

It's a Double Cab GMC Thing! I think?

 

The numbers don't always jive at the pumps when I fill up the tank. They have been slightly better, and as much as 1/2 MPG worse for the overall. That is not always an exact science either, because some pumps shut off earlier than others.

Other thing is that the pump may not always give you the same amount of gas that it says it is. So you may be getting 22 gallons when you are paying for 22.5 or 23 gallons. In my 02 yukon it had a "gallons used" screen. I would reset it every time I filled up. I would check the avg MPG screen on the truck. The inboard computer would always agree. Sometimes rounding, say if it was hand Calc 10.45, then the computer showed 10.5 mpg. But the gallons used and refuel at the pump never agreed. With the fuel used always being lower by atleast .5 gallons.

 

 

So my belief is that the truck DIC may be more correct than we think. Now I'm not saying that it's exact. But I don't think it's off by the 1+ MPG (ie, DIC shows 16 mpg while hand Calc shows 15 mpg).

 

 

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[Ventilator]

Other thing is that the pump may not always give you the same amount of gas that it says it is. So you may be getting 22 gallons when you are paying for 22.5 or 23 gallons. In my 02 yukon it had a "gallons used" screen. I would reset it every time I filled up. I would check the avg MPG screen on the truck. The inboard computer would always agree. Sometimes rounding, say if it was hand Calc 10.45, then the computer showed 10.5 mpg. But the gallons used and refuel at the pump never agreed. With the fuel used always being lower by atleast .5 gallons.

 

 

So my belief is that the truck DIC may be more correct than we think. Now I'm not saying that it's exact. But I don't think it's off by the 1+ MPG (ie, DIC shows 16 mpg while hand Calc shows 15 mpg).

 

 

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1/2 = 0.5 MPG

[Mike1220]

1/2 = 0.5 MPG

Yes I know. I was just throwing in my $ .02 on why I think the numbers at the pumps don't agree with DIC readings and such.

 

 

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[fondupot]

yesterday I decided to fill the truck up with E85 for the first time. I have to say the increase in power is definitely noticeable. I cant give a fair comparison to gas mileage yet because I was driving into a 25mph headwind yesterday which would kill mileage even with regular gasoline. But so far after mostly highway driving around 70-75 mph after about 200 miles my tank average is 15.6 mpg. NOT BAD imho even fighting that 25mph headwind.

 

i was driving to visit family yesterday for Fathers day which is why i decided to just try the E85. But it isnt exactly convenient for me to fill up with normally. But I think ill go out of my way to fill up with E85 for the next few tanks to get a good feel for the MPG.

[Northside]

I was getting my E-85 at a station nearby. They raised the price from 3.02 to $4.02. I was not happy. The extra power got me hooked, then they raised the price to way more an even premium. I found another place about 5 miles out of my way where it was $2.99. After running it for a few months now I don't think I could go back to E-10. The extra spunk in the truck is worth going out of my way for. I have gotten 18 plus mpg on the highway, and I'll take that.

 

I'll be curious to see how you do and what you think.

[fondupot]

I was getting my E-85 at a station nearby. They raised the price from 3.02 to $4.02. I was not happy. The extra power got me hooked, then they raised the price to way more an even premium. I found another place about 5 miles out of my way where it was $2.99. After running it for a few months now I don't think I could go back to E-10. The extra spunk in the truck is worth going out of my way for. I have gotten 18 plus mpg on the highway, and I'll take that.

 

I'll be curious to see how you do and what you think.

 

Dang thats ridiculous that they raised it so much! The stations near me are all around 2.82-2.99.

[00Silverado4x4]

I was getting my E-85 at a station nearby. They raised the price from 3.02 to $4.02. I was not happy. The extra power got me hooked, then they raised the price to way more an even premium. I found another place about 5 miles out of my way where it was $2.99. After running it for a few months now I don't think I could go back to E-10. The extra spunk in the truck is worth going out of my way for. I have gotten 18 plus mpg on the highway, and I'll take that.

 

I'll be curious to see how you do and what you think.

That had to be a mistake, raise it a dollar exactly? Hmmm? I'd call them out on that. My experience was they showed one price on the board and another on the pump. The pump was higher of course. I told them to either change the price at the pump or I go somewhere else....even though I couldn't for e85. They told me no so I walked. Just as I got to my truck the manager came running out and got the priced changed...sweet.

[KARNUT]

I have been running E85 mostly a couple times I was getting ready for a trip so I stop to top off. I wasn't paying attention and put in 93 gas in about seven gallons. My gas mileage went up in an instant and stayed that way thru the tank. My performance seemed to act like E85. Is that possible or my imagination? It went from 14 in town to 18 in town like does on 93 gas. Is it possible to have the best of both? I did it twice same results.