General Petrol v Diesel MPG

Discussion in 'General Discussion' started by Duc de Pommfrit, Wednesday 17th Dec, 2014.

  1. Duc de Pommfrit Moderator Staff Team

    United Kingdom Chester Northumberland
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    So I went to Scotland last week, the journey up was in a Toyota Avensis (not sure on engine size) diesel, the return journey in an Accord Type-S 2.0l petrol.
    The weather was very cold (-2 to 1 degree) so left both cars on cruise control set at 70mph.

    Toyota MPG readout was 48mpg, while the Accord was 41mpg/dropping to 39mpg for the last half hour.
     
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  2. Nels Moderator Staff Team

    If I could achieve over 40+MPG from a 2.0 petrol running on cruise at 70mph I'd be content to change back.
    Your new Accord has the DOHC Z series, whereas the 2.0 8th gens have the R series.
    Does anyone have any views on which is better?
     
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  3. DeviateDefiant Co-Founder Staff Team

    United Kingdom Leo Northants
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    To do a bit of maths on that comparison, with current averages from here.

    MPGAverage PriceCost per Mile
    Petrol39£1.1613.5p
    Diesel48£1.2211.6p
    It costs 14.5% more to drive a petrol based on fuel alone (in this scenario).
     
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  4. Nels Moderator Staff Team

    If you rack up the miles, that's a considerable amount of money. It all depends on the depth of your pockets.
    I think I will be going back to petrol when I next change, as I don't do as many long trips.
     
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  5. DeviateDefiant Co-Founder Staff Team

    United Kingdom Leo Northants
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    K-Series on the 7th Generation mate, K20Z2 on his Facelift.

    Between the K20A6, K20Z2 and R20A2 - there's all of 1hp between them, and 2lb/ft. I believe the difference will be in the economy, though I haven't looked up the figures. The R-Series engine has higher compression than the two Ks.

    :party:
     
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  6. Duc de Pommfrit Moderator Staff Team

    United Kingdom Chester Northumberland
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    I picked the Toyota up on Friday lunchtime, it came filled and had to be refilled when dropping off. I did some driving about on Friday afternoon, then Cramlington to Stirling where I replaced the fuel used. £21.80 including a bar of chocolate for my daughter.
     
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  7. Nels Moderator Staff Team

    Ooops, meant K. Don't know where Z came from. :no:

    I would like a K series, as there is so much known about them on here.
    However, looks like it'll be a R when I change. As much I I'd love a 2.4, I really don't need the extra power. If I say that often enough, I'll eventually believe it! :Whistle:
     
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  8. DeviateDefiant Co-Founder Staff Team

    United Kingdom Leo Northants
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    I average around 31mpg in most circumstances on my K24, it's a healthy mix of pottering around town and motorway. The former drops to about 27mpg as a minimum, the latter about 38mpg at the high-end. I have a very heavy foot, you could easily beat that.
     
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  9. Nels Moderator Staff Team

    That's not too bad.
    No. You mustn't try and persuade me. I must be strong. 2.0 is what I need. :Smile:Devil: 2.4 is what you want. :Devil: 2.4 is what you want. :Devil:)
     
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  10. Duc de Pommfrit Moderator Staff Team

    United Kingdom Chester Northumberland
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    Are you changing your car @Nels? If you need help @Nighthawk and myself could sort it within a day!
     
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  11. DeviateDefiant Co-Founder Staff Team

    United Kingdom Leo Northants
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    Don't be silly, the devil would have you stay with diesel :Whistle:

    :Rolf:
     
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  12. Nels Moderator Staff Team

    I've been looking for a while. Do I hold out for whatever comes after the Accord, or go for an 8th Generation?
    What do you think?

    With my mileage now, I'd be :PullFaces:to have a diesel. Will miss that torquey engine though. :Frown:
     
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  13. DeviateDefiant Co-Founder Staff Team

    United Kingdom Leo Northants
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    I'd go for an 8th Generation personally, I do not believe we'll see a successor a couple of years yet.
    Not with a K24 you wouldn't :Wink:
     
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  14. Nighthawk Guest

    United Kingdom Richard Milton Keynes
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    :Thumbup:
     
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  15. MickyB Expert Advisor ★ ★ ★ ★ ★

    Oh the power of dreams!!! You'll never look back from 2.4:Wink:
     
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  16. jd1959 Valued Contributor ★ ★ ★ ☆ ☆

    Ireland Zack Kilkenny
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    Here in Ireland people are diesel mad, it's very hard to find a petrol people carrier these days and having to have an automatic I expect slightly worse economy. I have owned a diesel before and given the type of driving I do, short runs for school, to the shop and so on it would never get warm enough to return good fuel economy, and then add in more frequent fuel filters, larger hull oil capacity, higher battery wear, particulate filters, duel mass flywheels, high pressure fuel pumps and injectors, not to mention turbo seals and bearings... and the specialist tools and knowledge, the list goes on and on of very expensive potential repairs. I was comparing fuel economy with a Renault Espace 1.9tdi manual driver and my fuel economy was slightly more than 1km/l better (a bit of apples and oranges comparison) and I have spent nothing on repairs in the last few years verses a small fortune, granted it is a Renault :shock: (we both do the same type of driving). If I were doing a lot of miles it would make since to go diesel, but not for the average driver when the bigger picture is looked at.

    Unfortunately my feelings are rarely shared here and people dismiss me as a bit odd, well I guess if the shoe fits....
     
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  17. ArcticFire-Account Closed Banned Getting Started

    Scotland Graham Scotland
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    Thing is with power and torque is that the max figures aren't really the important bit, it's the actual power and torque bands. No point having bags of torque if it drops like a stone in the water half way up the rev range and if the power also levels off then you really aren't going to accelerate much more without changing gear.

    Ignoring gear ratios etc, from what I understand if your power keeps going up then it will allow you to keep accelerating at the same rate. Ideally you want a nice flat band of max torque to provide the acceleration rate and increasing BHP in order to maintain it.

    The 2.2 cdti diesel doesn't have a huge torque band but it's OK, however, the BHP levels off so basically you won't be able to maintain the acceleration rate above approx 3,000rpm. A remap though can keep that BHP going up so even though your torque will still drop you can still maintain the acceleration rate right up to 4,500rpm.

    I like the tent peg analogy, torque is how hard you hit the peg and BHP is how many times you hit it lol
     
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  18. Karl_T Club Member ★ ☆ ☆ ☆ ☆

    Karl_T UK
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    The choice is sooo much easier when your current motor is an uneconomical diesel. My current motor an Alfa 159 2.4JTDM Sportwagon does 20 round town and rarely sees north of 38. 200bhp and 400Nm of torque has its penalties. It is however blisteringly quick, but EGR issues and a very short regen interval on DPF regens due to short commutes just mean its the wrong car. And I don't know about you fellas, but how often do you really get to play with all that power these days? I seem to find myself in queues and stop start traffic so often these days. Far more than nice open B roads. I will make no comment about Alfa reliability, but I'm buying a Honda, work it out. ;0)
    So in my pursuit of some ooomph and and reliability I've been hunting Accord 2.4 Tourer's, would've preferred a manual, but the extra fuel economy on the auto and the fact it'll make the commute and the queues so much easier, has meant my deposit went on an auto. I suspect I won't be a lot worse off each week. Anyone got any real world MPG figures for a 2.4 auto?
     
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  19. ArcticFire-Account Closed Banned Getting Started

    Scotland Graham Scotland
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    Honest John has a real world MPG section in the website if it also helps.
     
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  20. Karl_T Club Member ★ ☆ ☆ ☆ ☆

    Karl_T UK
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    Nothng listed for 2.4 Tourer, but 32 for saloon. I can live with that. :0)
     
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