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Corvette Today Interviews Harlan Charles Re The C8 & More: ON NOW

What a wonderful Corvette Today podcast!!! Steve Garrett sits down with Corvette Product Manager, Harlan Charles on this episode of CORVETTE TODAY.  https://anchor.fm/steve-garrett/epis...enea/a-a2qtt60. Harlan talks about his early years with Chevrolet and how he became Product Manager for Corvette. He also discusses the cohesive work done by the entire Corvette team-from C5 through C8.  You'll learn about the evolution of the new mid-engine C8 Corvette and the steps taken to bring it to market. Plus, Harlan delves into the launch of the C8, the development of the strategy behind the mid-engine car.
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POLL: Do you use Top Tier fuel?

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  • POLL: Do you use Top Tier fuel?

    Is Top Tier just a way for advertising/promoting certain brands of fuels fuels that pay into a “accreditation fund” OR is it a good measuring standard to insure the fuel you put into your Corvette and other vehicles truly meets higher than average standards including having specific amounts of legit engine cleaners and insuring maximum amount of non-desired deposits in the fuel you put into your vehicles? Thanks GM Authority for focusing this poll question.

    Originally posted by gmauthority
    Where To Find Top Tier Fuel For Your GM VehicleSponsored Links



    For those discerning GM vehicle owners that want only the best for their ride, the judicious attitude shouldn’t stop with fluids, filters, and maintenance. The fuel you put into the gas tank can be just as important, as some fuel is objectively better than others. As such, General Motors recommends only using Top Tier fuel, and now, GM Authorityis making it easy to find Top Tier fuel retailers (or gas stations) to frequent for those fill-ups.



    For those who may be unaware, Top Tier fuel is a fuel performance standard written by the world’s major automakers, including General Motors, Toyota, Volkswagen, Honda, FCA, and others. The standard is intended to maximize engine performance, improve fuel economy, and lower emissions by stipulating a higher level of fuel quality via stricter deposit control.

    The automakers listed above felt as though the minimum deposit control requirements put forth by the EPA fell short of ensuring optimal engine performance. As such, in 2004, the Top Tier fuel economy standard was written for greater deposit control performance, thereby providing GM vehicle owners with assurance that the fuel they buy is of a high quality.



    The Top Tier fuel designation is only given to fuels with a higher level of engine cleaning performance through the use of deposit control additives. Top Tier fuels cannot contain harmful metallic additives, and must be available across all octane levels of the associated fuel marketer’s stations.

    These days, with the highly advanced engines equipped in modern GM vehicles, having the best possible fuel on board provides peace of mind that the engine will run at optimal levels of performance, returning maximum miles per gallon, lowering the environmental impact coming out the tailpipe, and of course, maximizing power when hitting the throttle. However, not all gas stations provide Top Tier fuel.

    As such, GM Authority has provided a table that lists the retailers offering Top Tier fuel. Check it out below:

    https://gmauthority.com/blog/2020/08...ur-gm-vehicle/


    Top Tier is:
    55
    Nothing I care about
    12.73%
    7
    Buy it. While a way of promoting certain brands BUT it is legit, has higher minimum standards
    5.45%
    3
    Sometimes I buy it, but mostly choose my gas by other factors
    5.45%
    3
    I seek it out, use it most of the time, but do not sweat if I can not find it.
    21.82%
    12
    Seek it out; use it almost 100% of the time and always in my Corvette
    54.55%
    30
    GBA Black; HTO Twilight/Tension interior; Z51 & Mag Ride; E60 lift; 5VM visible carbon fiber package; 5ZZ high wing; FA5 interior vis CF; ZZ3 engine appearance; 3LT; Q8T Spectra Gray Tridents; J6N Edge Red Calipers; SNG Edge Red Hashmarks; VQK Splash Guards; RCC Edge Red engine cover; VJR illuminated sill plates. Lifetime, annual contributors, and 22 year members of National Corvette Museum. Home is the beautiful Pacific Northwest.

  • #2
    You will never know or experience a difference.

    Comment


    • #3
      Mazda and Subaru are checking at least your fuel octane rating and perhaps more than that if you have a fuel related warranty claim. Anyone know if GM is?

      Comment


      • #4
        Yep, I use Top Tier almost always, unless I'm on a road trip and can't easily locate it.

        I've also got a Costco nearby, they are Top Tier, and they've also got the lowest price for premium (93 octane) in town. It's been a while since I compared local premium prices, but the last time I did check I was saving around $6/tank buying at Costco.

        A couple of weeks ago, while filling up at Costco, the attendant came over to check-out the C8. I mentioned that I was glad they had Top Tier fuel, he nodded and he mentioned that he maintains the station's pump filters, which capture all particles in the fuel greater than 10 microns. Apparently that's better then the industry standards/requirements as well.
        My C8:
        '20 Elkhart Lake Blue 2LT Coupe, Natural Interior, GT2 Two-Tone Seats, Performance Exhaust, Front Lift, Carbon Flash Wheels, Engine Appearance Package 2000 Status December 27, 2019; 3000 Status January 2, 2020; 3400 Status March 10, 2020;TPW March 16, 2020; Built June 4th, 2020; Delivery July 1, 2020

        Current Vettes:
        '68 Lemans Blue 327/350 Convertible
        '91 Turquoise Convertible with Hardtop
        '14 Lime Rock Green 2LT Convertible, Black Top, Kalahari, 7-Speed, Performance Exhaust

        Comment


        • #5
          When we did road trips (and again later resume them), we considered Costco locations in our planning for that reason.
          GBA Black; HTO Twilight/Tension interior; Z51 & Mag Ride; E60 lift; 5VM visible carbon fiber package; 5ZZ high wing; FA5 interior vis CF; ZZ3 engine appearance; 3LT; Q8T Spectra Gray Tridents; J6N Edge Red Calipers; SNG Edge Red Hashmarks; VQK Splash Guards; RCC Edge Red engine cover; VJR illuminated sill plates. Lifetime, annual contributors, and 22 year members of National Corvette Museum. Home is the beautiful Pacific Northwest.

          Comment


          • #6
            I have to put 'premium in all of our cars. I usually buy at RACETRACK, WAL-MART or SAM's. I've run the stuff in all my cars forever with no issues and they have all been 'high performance' rides. I guess I don't understand the big deal about 'top tier'.....
            C8 Deposit July 2018 (HTC). In the system: Jan 20. Torch Red with lots of goodies. Museum Delivery in Sept.... maybe.

            Other toys in the garage: Ferrari California, BMW i8 Roadster, Bentley Flying Spur

            Comment


            • #7
              Gas Test Findings


              For its test, the lab operated an engine continuously for 100 hours on a cycle to represent 4,000 real-miles of use. The engine was then disassembled, photographed, and its key components weighed and measured to determine the thickness of carbon deposits. Six fuels were used, randomly selected and split among three basic gasoline sources and three Top Tier.

              The results showed that on average, Top Tier gasoline had 19 times fewer carbon deposits on injectors, intake valves, and in the combustion chamber when compared to regular gasoline.

              AAA also found Top Tier gasoline can have a cleansing effect, reducing intake valve deposits by 45 to 72 percent when used over a 5,000-mile interval. Variation in the results is attributed to the detergents used by different brands.

              Further, analyzing gas prices over a 12-month period found just a three cent price difference between non-Top Tier and Top Tier gasoline.

              Bottom line: For the nominal investment, this study shows that motorists would benefit from using Top Tier gasoline as their primary fuel.
              https://www.consumerreports.org/car-...h-extra-price/
              My C8:
              '20 Elkhart Lake Blue 2LT Coupe, Natural Interior, GT2 Two-Tone Seats, Performance Exhaust, Front Lift, Carbon Flash Wheels, Engine Appearance Package 2000 Status December 27, 2019; 3000 Status January 2, 2020; 3400 Status March 10, 2020;TPW March 16, 2020; Built June 4th, 2020; Delivery July 1, 2020

              Current Vettes:
              '68 Lemans Blue 327/350 Convertible
              '91 Turquoise Convertible with Hardtop
              '14 Lime Rock Green 2LT Convertible, Black Top, Kalahari, 7-Speed, Performance Exhaust

              Comment


              • #8
                Top tier is not, as option #2 suggests, a way to promote certain brands of gas. It was developed by auto manufacturers who found the US EPA standard detergent levels weren't enough to prevent carbon deposit build up.

                I use it almost all the time in all my cars. But if I'm somewhere that I can't get it, I don't sweat a tank or two of "lower grade" gas. Ironically, it's probably less important in a Direct Injection engine like the LT2 than in a port injection engine, but still has value.

                And most of the time it's cheaper than non Top Tier for me. Costco's gas meets Top Tier specs, and is 30 to 50 cents a gallon cheaper, for premium, than most of the non Top Tier stations around.
                SunKissed, my 2015 2LT, 7MT, Black over Daytona Sunrise Orange Metallic, Stingray convertible (One of about 40)

                Purchased 5/2/2015,
                >36,000 miles

                Proud member of the Old Dominion Corvette Club. Check us out http://www.olddominioncorvetteclub.org

                Never grow up - It's a trap.

                Comment


                • #9
                  Originally posted by 5632 View Post
                  You will never know or experience a difference.
                  BMW and VW owners will prove you're wrong. They've had extreme carbon build up problems with non Top Tier fuels.
                  SunKissed, my 2015 2LT, 7MT, Black over Daytona Sunrise Orange Metallic, Stingray convertible (One of about 40)

                  Purchased 5/2/2015,
                  >36,000 miles

                  Proud member of the Old Dominion Corvette Club. Check us out http://www.olddominioncorvetteclub.org

                  Never grow up - It's a trap.

                  Comment


                  • #10
                    Originally posted by meyerweb View Post

                    BMW and VW owners will prove you're wrong. They've had extreme carbon build up problems with non Top Tier fuels.
                    Sorry but I was talking or referring to American cars that don't have problems.

                    Comment


                    • #11
                      As a side to this post, there is an app for ethanol free fuel, Pure Gas. Many of these fuel stations are marinas! Not sure if even the BP marinas advertise as Top Tier. Most premium ethanol free fuels only have a maximum octane rating of 91. That octane rating, however, is equal to the 93 octane rating of most ethanol blended premium grade fuels. Of course, ethanol fuels are more harmful for carbureted engines than ones that are DI. Nevertheless, for long term storage, 10% ethanol blended fuels are not recommended. I always put ethanol free fuels in my motorcycles for winter storage and keep the tanks full. I generally also doctor those fuels with Sta-Bil. SeaFoam, and for carbureted bikes, Mystery Oil! Equally important as is Top Tier fuel for our Corvettes in daily driving, is to properly stabilize a full tank of fuel with additives specifically made for ethanol blended fuels during reduced driving periods or winter storage!!
                      GD0 Accelerate Yellow Metallic; 3LT; HUE Natural Napa Leather; AE4 Competition Sport Seats; FA5 CF Interior Trim; Z51; FE4 Mag Ride Suspension; E60 Front Lift; Q8Q CF Open Spoke Wheels; J6F BR Brembo Calipers; RCC ER Intake Cover; DTH CF Racing Stripes; ZZ3 Engine App Package; VQK Splash Guards; ERI Battery Protection; R8C Museum Delivery

                      Proud LTM NCM.

                      Comment


                      • #12
                        Thanks Mobius; great post of yours!
                        GBA Black; HTO Twilight/Tension interior; Z51 & Mag Ride; E60 lift; 5VM visible carbon fiber package; 5ZZ high wing; FA5 interior vis CF; ZZ3 engine appearance; 3LT; Q8T Spectra Gray Tridents; J6N Edge Red Calipers; SNG Edge Red Hashmarks; VQK Splash Guards; RCC Edge Red engine cover; VJR illuminated sill plates. Lifetime, annual contributors, and 22 year members of National Corvette Museum. Home is the beautiful Pacific Northwest.

                        Comment


                        • #13
                          Its hard to avoid TT fuel in Vermont. Most of our major brands,Exxon/Mobil, Irving, Sunoco, Citgo and Shell are TT. Gulf, qnd Cumerlqnd Farm are not TT. I mostly buy Irving, Mobil, and on occasions, Citgo.

                          Comment


                          • #14
                            Ethanol free....premium for me... in my high performance cars ...
                            You achieve less horsepower with fuels containing 10% ethanol ... its fine for my daily driver Camry though ...

                            Comment


                            • #15
                              If available I always fill up with Shell. Use it in all of our daily drivers.

                              Comment

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