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  • FIRST POST
    • QQQ
    • By QQQ 7th Sep 17, 10:32 PM
    • 270Posts
    • 13Thanks
    QQQ
    Petrol vs Diesel vs LPG vs Hybrid - pure math
    • #1
    • 7th Sep 17, 10:32 PM
    Petrol vs Diesel vs LPG vs Hybrid - pure math 7th Sep 17 at 10:32 PM
    Over last 10 years of all money I spent on car depreciation, petrol and insurance, I spent roughly 60% on fuel, 30% on insurance and less than 10% on car depreciation and repairs.
    Therefore I am thinking very carefully on how to reduce mpg on my next car.

    Here is my question:
    If I spent £100 driving a petrol car 70% in town and 30% on motorway, how much on average would I spend driving same type of car on same route but:
    - with a diesel engine
    - with LPG
    - hybrid (and not plug in hybrid)
Page 1
    • Tarambor
    • By Tarambor 7th Sep 17, 11:02 PM
    • 1,166 Posts
    • 809 Thanks
    Tarambor
    • #2
    • 7th Sep 17, 11:02 PM
    • #2
    • 7th Sep 17, 11:02 PM
    Diesel saves typically around 40% over petrol.

    LPG saves typically around 45% over petrol.

    Hybrid, don't know.

    All the above based purely on the cost of fuel/MPG, not any other differences.
    • happyc84
    • By happyc84 7th Sep 17, 11:04 PM
    • 125 Posts
    • 73 Thanks
    happyc84
    • #3
    • 7th Sep 17, 11:04 PM
    • #3
    • 7th Sep 17, 11:04 PM
    for figures to work, would be good to know:-

    average miles pa.
    how new were the cars?
    average mpg.

    over the last 10 years, my biggest cost has been vehicle deprecation.
    • Mercdriver
    • By Mercdriver 7th Sep 17, 11:42 PM
    • 1,371 Posts
    • 911 Thanks
    Mercdriver
    • #4
    • 7th Sep 17, 11:42 PM
    • #4
    • 7th Sep 17, 11:42 PM
    Also on Hybrid, you'd need to consider whether plug in or other hybrid. If plug-in, you'd need to consider the costs of charging it on leccy
    • bigadaj
    • By bigadaj 8th Sep 17, 5:58 AM
    • 10,004 Posts
    • 6,399 Thanks
    bigadaj
    • #5
    • 8th Sep 17, 5:58 AM
    • #5
    • 8th Sep 17, 5:58 AM
    Diesel saves typically around 40% over petrol.

    LPG saves typically around 45% over petrol.

    Hybrid, don't know.

    All the above based purely on the cost of fuel/MPG, not any other differences.
    Originally posted by Tarambor
    But diesel isn't going to give those savings with 70% town driving.
    • GunJack
    • By GunJack 8th Sep 17, 6:28 AM
    • 9,698 Posts
    • 7,226 Thanks
    GunJack
    • #6
    • 8th Sep 17, 6:28 AM
    • #6
    • 8th Sep 17, 6:28 AM
    But diesel isn't going to give those savings with 70% town driving.
    Originally posted by bigadaj
    no, but will still be a significant saving, probably more like 30%. I do most of my driving on the 30mile round trip to work which is much closer to the extra urban pattern, and have just changed from a 1.4L petrol to a 1.4l diesel and am expecting a 50%-ish increase in mpg on that journey (I can get 60mpg in a 2ltr Mondeo TD just doing that run, the 1.4 should get 65+)

    If it was 70% town I'd expect 30-35% improvement as the diesel won't get up to and maintain efficient temp so easily around town.
    ......Gettin' There, Wherever There is......
    • Car 54
    • By Car 54 8th Sep 17, 7:38 AM
    • 2,237 Posts
    • 1,435 Thanks
    Car 54
    • #7
    • 8th Sep 17, 7:38 AM
    • #7
    • 8th Sep 17, 7:38 AM
    Also on Hybrid, you'd need to consider whether plug in or other hybrid. If plug-in, you'd need to consider the costs of charging it on leccy
    Originally posted by Mercdriver
    But the OP said "hybrid (and not plug in hybrid)"
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