When will my fuel tank be full?

is that a joke?

someone failed math...

The car cannot be 100% efficient with fuel, otherwise you would never need to fill up a car with petrol.

Fuel + Oxygen = "Energy" + Carbon Dioxide + Other Trace Substances.

Take Fuel out of that equation and you'd get air. The Fuel is used up.

The thing youve done wrong is added up the percentages, instead of doing it properly.

Your fuel saves you 50% so really you get 150% of what youd usually get. The 30% on tyres is added to this, so you add 30% of 150, then 20% of (150 + 30% of 150). You end up doing more miles to the gallon, instead of no fuel consumption.

These claims are a) to convince you to buy 1 brand over another and b) usually a "maximum" or "average" saving over a very poor substitute.

Cars are not 100% efficient. The devices you mention should reduce your consumption for an equivalent style of driving though the maximum savings are only ever likely to be achieved in labaratory conditions.

Your fuel consumption also depends on how well maintained your engine is and how you drive.

Are you serious? I never heard of a fuel that saves you 50% or tires that save you 30% or even oil thatc can save you 20%. I suggest you park the vehicle and just look at it, that way you never use any fuel.

It unquestionably does not be counted no be counted in case you force with an entire tank or an just about empty tank. The mileage distinction is maximum possibly minute and uncalculatable. gas weighs below ten pounds a gallon, greater like consistent with possibility seven, so the version between finished and 1 / 4 finished on maximum vehicles is approximately consistent with possibility 50 pounds. it particularly is way below your fatass mom in regulation once you drag her to the Friday night bingo interest. Hauling her around will fee you many greater suitable than donning an entire tank of gas. Even a pair of cases of Bud weigh greater suitable than the gas. The gas gadget is closed, so in the experience that your motor vehicle is working precise you're no longer meant to have any gas evaporating besides. The EPA hates evaporated gas, and has made a buttload of regulations scuffling with it.

Add to the savings you have already made the fact that if you lose your car key the fuel consumption drops to zero, and you are really quids in.

There is no such thing as a 100% efficient car.

when you put 50 quids worth of petrol in

Added up it still doesn't add up to 100% savings.

Another victim of the marketing hype...

You must have a leak.