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  • AdrianC
    AdrianC Posts: 42,189 Forumite
    Eighth Anniversary 10,000 Posts Name Dropper
    force_ten wrote: »
    So the sum total of working you can show is that there are lots of hits stating it as a fact but without actually quoting any source or research or even anecdotal evidence? Merely "It is, because we say it is"?

    Does this apply to all vehicles equally? Does it apply to a large van, a citycar and a sportscar?
    Does it apply linearly? Each 50kg means 2%? 500kg means 20%? 2500kg means 100%?
    Does it apply in inverse, too? Each 50kg saved means 2% reduction? Why does nobody tell the car manufacturers this?
    Or is it a figure somebody's plucked from their chuff, decided it sounds about right, and it's been adopted as some sort of inviolable fact?
  • Hi,

    you will never get the same mpg on any identical journey, stop/start, traffic lights, holdups, etc,

    and how anybody selling a car can say 'you will get 40/50 mpg is rubbish, how does the seller know how you drive the car or in what conditions.
  • Joe_Horner
    Joe_Horner Posts: 4,895 Forumite
    Ninth Anniversary Combo Breaker
    force_ten wrote: »
    carrying an extra 50kg of Weight will increase your fuel consumption by about 2%

    That general assumption is based on most peoples poor driving habits. If you drive appropriately, you can carry weight (within reason) at the same speed without any appreciable increase in fuel consmption.

    Extra weight makes virtually no difference at all at steady speed, improves fuel consumption downhill / slowing down and only increases it when acceleratig or going up hill.

    The increased consumption comes because people use extra fuel getting up to speed, but then don't ease off earlier when they slow down. So they waste the extra momentum that the weight's given them (which is energy from the fuel they burnt) by having to brake harder.
  • Hi,
    Joe_Horner wrote: »
    Extra weight makes virtually no difference at all at steady speed, .

    so Formula One cars load up with a full tank at every pit stop?
  • topdaddy_2
    topdaddy_2 Posts: 1,408 Forumite
    edited 8 August 2024 at 1:41PM
    Hi,



    so Formula One cars load up with a full tank at every pit stop?

    No they start with a full tank.
  • force_ten
    force_ten Posts: 1,931 Forumite
    Eighth Anniversary 1,000 Posts Combo Breaker
    this site is called Money saving expert

    in the Motoring Money Saving section there is 40 quick tips to cut driving costs

    tip number 17 says Declutter your car to cut fuel costs
    Keep your tyres inflated

    Efficiency improvement: Up to 3%. Lower tyre pressure increases the drag on a car meaning you need more fuel, so regularly check the pressures are correct.

    Declutter your car

    Efficiency improvement: Up to 2%. The lighter your car is, the less effort it needs to accelerate. So declutter: clear junk from the boot, and ditch unnecessary weight.

    Take your roof rack off

    Efficiency improvement: Up to 2%. A roof rack adds massive wind resistance, increasing drag and making the engine work harder. Don't need it? Remove it.

    Turn off air conditioning at lower speeds

    Efficiency improvement: Up to 8%. Air con uses an incredible amount of fuel, so turn it off unless really needed. The general consensus is it's more efficient to drive with the windows down and the air con off at lower speeds, but at higher speeds it's better to use the air con and keep windows up due to the extra drag caused.

    Don't fill it up

    Efficiency improvement: Up to 1%. Fuel's heavy, so by filling up you're adding weight. The less fuel your car holds, the more efficiently it drives. Filling up slightly more often and putting less in (1/2 or 3/4-full) will make it more efficient.

    if i am not mistaken it says dont fill up and de clutter your car and i get accused of posting rubbish
  • Hi,
    topdaddy wrote: »
    No they start with a full tank.

    thanks,

    but when it comes to a pit stop, the high tech folks will decide how much fuel is needed to finish the race, there have been times when a car has run out of fuel on the last lap.
  • force_ten
    force_ten Posts: 1,931 Forumite
    Eighth Anniversary 1,000 Posts Combo Breaker
    topdaddy wrote: »
    No they start with a full tank.

    No they start with enough fuel to finish the race

    you wont see any overweight formula one drivers, its all about weight saving
  • AdrianC wrote: »
    Your car weighs a ton and a half or so - 1,500kg. A full tank of fuel weighs about 50kg.

    Seriously, how much do you think that a weight difference of one third of one percent is going to make?

    Seriously, how much do you think that a weight difference of 3.3 percent is going to make?
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