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Volvo C70 Fuel and Mileage Questions

ClairesClaires Chicago areaPosts: 974
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  • jaspar1jaspar1 Posts: 1
    1999 Volvo c70 coupe 27 - 240,000 miles - 27 mpg combined
  • 15 mpg. 6 miles of stop and go. 1999 C70 Convertible.
  • tsk1tsk1 Posts: 31
    2007 Volvo C70 - with Geartronic - 2218 miles in Europe - 1400+ of which were on the German Autobahn (90-100+ MPH) - 24.7 MPG
  • 2001 C70 Coupe:
    17 mpg street, 23 mpg highway

    Running on Mobil1
  • lemennlemenn Posts: 89
    At this stage,
    32.7 miles/gal with the new C70 D5 turbo diesel engine
  • johnh7johnh7 Posts: 67
    Maybe this is a stupid question. I realize this car is an "it's ok to use regular but premium may produce better performance" type, but what octane gas are you guys using?
  • I wish someone would answer your question because I would like to know the answer too. My car will be here in a couple of weeks. The Volvo dealer told me that guys in their service dept said that using regular is just as good as using premium that the car will calibrate to whatever gas is used (but to not switch back and forth). I've also heard that not just the octane grade is important but also whether the gas is "dirty" or not... some brands (like Conoco) have "cleaner" gas and don't have as much sediments. This is not as much of a worry since most brands got wise to this and have cleaner gas now. It was a process that they were using. I could be so far off base on this (so feel free to correct me if I'm wrong). I'm going off of opinions that I've heard. Thanks.
  • tsk1tsk1 Posts: 31
    Having used regular, mid-grade and premium, each for multiple tanks, our 2007 C70, T5 does run fine on either. No pings or delays. It does seem a bit quicker with premium. I do notice about a 1.5-2.0 mile per gallon improvement with premium under what I believe to be the same driving conditions. We will probably lock on either mid-grade or premium.
  • jtregojtrego Posts: 68
    Premium gas will definitely give better gas mileage under most driving to performance...I have heard this discussion so many times and from so many different perspectives always with the conclusion that acceleration and performance should be better with premium when the car is taxed out.

    In other words, to get the hp that is always quoted by the manufacturer of the engine you have to use high octane. for everyday driving...gas mileage is more affected by "how" you drive. If you are always stomping on the gas or reving to the highest rpm, etc, etc then your gas milelage will stink no matter what grade gas you use. However, under somewhat restrained or normal driving you should see improvement in gas mileage with higer octane...but then you pay for what you get don't you?

    I have always noticed the biggest difference with premium on long trips on the highway where you don't have to stop as often with premium.
  • Did a Google search and found a good article at USA Today online. There is a lot of debate about Premium vs. Mid-Grade vs. Regular. I like the quote from the 45-year veteran engineer with Chevron Oil who also sits on the SAE committee regarding his wife's use of low octane. This article has helped me make up my mind. Here it is
  • johnh7johnh7 Posts: 67
    Great article. My dealer recommends regular by the way.

    He said if I was even more of a nut than I already am and if I was buying and not leasing, I could use premium for better peace of mind.

    I pick up my car in 8 hours.
  • I raise my cup (of tea) in a toast to wish you well!

    I pay for mine in 8 hours and await delivery in 8 days (I hope).

    Good luck - and best wishes to you, and all our forum contributors, for the forthcoming holiday break.
  • johnh7johnh7 Posts: 67
    I got mine. Everything I expected. So far - all parts seem to be working. The black/off black leather does look exactly as Stanwick's earlier pictures depicted. It's a very hot car.

    Good luck with yours
  • Just bought a 03 c70HT with 23k miles. Manual says it needs premium gas. Is this true? Any risks by not using premium?
  • tmarttmart Spring, TXPosts: 1,006
    Believe the manual recommends premium, but the car will run fine on plus or regular. If you want max performance, then use premium.
  • We had a discussion thread going under "Meet the New Members" (off topic, obviously) but you can read it around messages #60-#70. Here is an article that I found on a Google search that you might find interesting.
  • From a technical standpoint, yes you can run on regular or premium. The computer can adjust the engine to compensate for the lower octane fuels.
    Question is why bother? Maybe when prices were less than $1/gal and the difference was 20 cents, you were paying a 20% premium. With gas prices north of $2/gal the difference is <10% for premium. Hardly worth all the fuss ;) .
  • qbrozenqbrozen Posts: 17,141
    By me, it is a 40 cent difference now, so at $1.99 for regular, the premium is about the same percentage. Not to mention, judging by percentages is not exactly logical for most people. 7% tax in my state doesn't phase me one bit when buying a $20 item, but it sure as heck makes a difference on a $20,000 car!

    '13 Stang GT; '86 Benz 300E; '98 Volvo S70; '12 Leaf; '14 Town&Country

  • gbrozen does have a very good point. 20% sounds high until you do the math and realize the annual difference is pretty small, especially if you factor in the lower fuel economy of the cheaper gas. I figure less than $20 per year difference based on 15,000 miles per year.

    IMHO: Can't imagine putting low octane fuel in a turbo-charged engine, unless it is an emergency.

    Sure it won't hurt the engine to run cheap gas occasionally, but you probably shouldn't buy a turbo-charged engine if buying premium gas is a problem (emotionally or financially).

    When you put regular in almost any modern engine, it automatically adjusts to avoid damage. This sounds okay, but it means the engine runs richer (injects more fuel) and retards the spark timing to prevent premature combustion of the fuel (ping). This means less power, and poorer fuel economy. Plus the extra fuel is not always 100% consumed, and could be passed to the catalytic converter. This extra fuel is not good for the catalytic converter, and over time (repeated use of regular in a turbo engine) could cause premature failure of the catalysts.

    Just my humble $0.02 on the issue. :)
  • I'm not sure I'm following all of the assumptions you made in your calcualtion, although I agree with your larger point that it is still not a huge amount of money.

    Ignoring (to begin with) a possible mileage difference between premium and regular, 15,000 miles/year translates to 750 gallons/year (at 20 mpg), or 517 gallons/year (at 29 mpg) - using the city and highway EPA ratings. Even with only a $0.20 difference between regular and premium (in some areas it is more like $0.25, or even higher), this works out to $103 to $150 per year.

    I realize that the above simple calculation assumes that the miles/gallon is the same, whether you are using premium or regular. So I guess the crux of the argument lies in whether there is actually a significant loss of miles/gallon in using regular, and if so, how much. I think this will largely depend on driving style, since the energy content of the two grades of gas is more or less identical. If you are a "heavy-footed" driver, then I think there will be more of a mpg impact, since the loss of peak power using regular (due to spark retardation, etc.) will lead to keeping the pedal down longer. But for someone who normally accelerates slowly, my guess is that the mpg penalty will be minimal or non-existent, and there will consequently be greater savings from using regular.

    In my own case, I think the savings from using regular will be minimal, and my preference will be for obtaining maximum power capability from the engine.

    I was interested to see that both the people at the dealer, and the owner's manual, "sanctioned" the use of lower octane fuels as being perfectly reasonable. Other cars I've had in the past that could use multiple fuel grades usually took more of attitude of "in an emergency I guess you could get away with using regular, but we really recommend premium".
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