A 1980s brochure claiming 35 MPG, a grandfather's notebook kept in gallons, a modern label at 6.5 L/100km. Three eras of fuel figures, translated onto one scale.
Boxes In The Store Room
Clearing a store room in Multan last winter, I found my grandfather's era in a tin box: two car brochures gone soft at the corners, and a fuel notebook, ruled by hand, in which petrol was bought by the gallon and journeys were recorded the way his generation recorded them, from memory, at the end of the month. The brochure in the box claims 35 MPG for a car my family owned for eleven years.
Converted honestly, on its own imperial gallon, that claim is 8.07 L/100km. Whether the car ever did it is a question this article will teach you to ask properly, because the asking turns out to be the whole skill. A fuel figure is only as honest as the system that produced it, and Pakistan has driven under three different systems in living memory.
The Imperial Era: Gallons, Brochures And No Test Cycle
Start with the gallon, because it is where the era hides its trap. The gallon of my grandfather's notebook is the imperial gallon, 4.54609 liters, the unit Pakistan inherited and used at the pump well into living memory. It is about 20 percent larger than the U.S. liquid gallon, and every MPG figure printed in that era, in brochures, in newspaper reviews, in the margins of notebooks like his, is an imperial figure. The brochure's 35 MPG therefore converts with the UK constant: 282.481 divided by 35 gives 8.07 L/100km.
Feed the same 35 into a converter silently set to the U.S. gallon and out comes 6.72 L/100km, a full class more frugal, and a car that never existed. This exact accident, with newer cars and higher stakes, is The Wrong-Gallon Story told elsewhere on this site; the imperial era simply industrialized it, because nobody at the time thought a gallon needed a surname.
The notebook tells the era's second truth. Against the brochure's 35, my grandfather's own recorded fills average out nearer 28 MPG imperial, which is 10.09 L/100km, and his entries were not the disciplined fill-to-first-click logs I keep now. They were gallons bought, rupees paid, and distances remembered at month's end, usually generously.
So the era leaves two numbers for one car, 8.07 claimed and 10.09 recalled, and neither was produced by anything a modern reader would call a measurement standard. Brochure figures of the time came from the manufacturers' own testing, arranged to flatter, with no common public cycle standing behind them that one maker could be held to against another.
My grandfather recorded fuel by the gallon and the distance by memory, and his memory always beat the car. I keep his notebook in the same drawer as my own fill log now, deliberately, as a warning about which of the two documents a family legend prefers to quote, and about how gently I should treat my own tidy numbers when my grandchildren find them.
The Import Era: km/L On Every Sheet
The second era arrived in shipping containers. Through the years when Japanese imports set the tone of Pakistani car buying, the figure that mattered was kilometers per liter, printed on auction sheets and repeated in every showroom conversation. A good family import of that period wore a figure like 16 km/L, which converts cleanly: 100 divided by 16 gives 6.25 L/100km, and on the UK gallon that is 45.20 MPG.
The unit was honest and the conversions are exact, which makes this era the easiest of the three to translate. What it shares with the imperial era is the soft spot underneath: the figure on the sheet was a Japanese laboratory result from that car's test regime, not a measurement from a Pakistani road, and it traveled across an ocean without its context, arriving here as a promise no laboratory had actually made.
My own generation learned to read this unit first, which is why the converter on this page shows a km/L readout beside every result. Millions of buying decisions in this country were argued in kilometers per liter, and half the fuel arguments at family tables are still one generation quoting km/L at another generation reading L/100km, each certain the other cannot count.
Today's Labels Speak A Third Language
The modern label speaks L/100km, and behind the better ones stands a regulated test with a name and a published procedure. A current figure like 6.5 L/100km converts to 43.46 MPG on the UK gallon, for any relative who still wants the conversation in gallons.
The improvement over the brochure era is not the unit, it is the accountability: Europe replaced its old NEDC cycle with the stricter WLTP, mandatory for all new cars from September 2018, and figures now carry the test's name with them, which is the entire subject of The WLTP Guide. Even so, a modern label remains a laboratory result, closer to the street than its ancestors and still not the street.
Three eras, one honest scale: the printed figures, converted
Each bar is a printed claim from its era, converted to L/100km with the correct gallon or formula. These are claims in three dialects, not road measurements, and the chart translates them without endorsing any of them.
Why The Three Eras Refuse To Be Ranked
Line the three bars up and a temptation appears: rank the decades, declare progress or decline. Resist it, and count the reasons. The test behind the figure changed, from maker's own bench to Japanese cycle to WLTP, so the numbers answer different questions. The fuel changed, in octane, in additives, in consistency, and an engine fed 1980s petrol and an engine fed today's are not running the same experiment.
The roads changed most of all: the Multan of my grandfather's notebook had a fraction of today's traffic, and a car that cruised his streets at a steady pace now spends its mornings idling in today's traffic, burning fuel at zero kilometers per hour. And the cars themselves changed weight, safety structure and appetite for accessories that drink power all day. A ranking across eras compares four moving variables and pretends it compared one.
An old fuel figure is a sentence in a dead dialect. Translate it faithfully, by all means, but do not mistake the translation for a measurement.
The classic-car reader and the family historian, the use case under this article, do not actually need a ranking. They need to know what a claim meant when it was printed, and how much of it to believe now. Translation answers the first need.
The discount answers the second, and the discount is steep: treat a brochure figure from the imperial era as the car's best-day claim under its maker's own rules, expect the surviving example to use a fifth to a third more on modern roads in modern traffic, and treat any notebook average as a memory first and a measurement second, my grandfather's included.
Fact-Checking A Family Claim
So when the claim arrives at your table, as it arrived at mine, that the old car did 40 MPG and modern cars are a swindle, run the household procedure this notebook taught me.
Convert first, with the imperial gallon, out loud: 40 MPG imperial is 7.06 L/100km, a figure a good modern family car matches or beats on its label, which usually ends the swindle theory on arithmetic alone. Then ask the question that separates history from legend: did anyone ever measure it at a pump, tank against tank, or does the number descend from a brochure and a good memory?
Ask it kindly. The notebook in my drawer records a man who loved his car and rounded in its favor for eleven years, which is not a crime in a grandfather or in anyone else. It is only a reminder that fuel figures have always been stories before they were numbers, and the older the story, the more of the telling is in it.
Questions People Ask About This Page
An Old Brochure Says 35 MPG. What Is That In L/100km?
It depends whose gallon the brochure meant, and in Pakistan and Britain of that era it was the imperial gallon of 4.54609 liters. On that gallon, 35 MPG is 8.07 L/100km. Run through the U.S. gallon by mistake, the same 35 returns 6.72 L/100km and invents a frugality the car never had.
Can I Compare My Grandfather's Car's Brochure Figure With A New Car's Label?
Not directly. The brochure figure came from the maker's own testing, the car has since aged through decades of wear, fuel has changed composition, and traffic has slowed. Convert the figure to modern units for a rough sense of the claim, then expect the surviving car to use noticeably more, and measure it at the pump if the number matters.
Why Do Older Pakistani Drivers Quote Fuel Figures In km/L?
Because importers and auction sheets stated them that way. Japanese domestic figures were published in kilometers per liter, and for two decades that was the number Pakistani buyers of imported cars learned to read, before L/100km labels became the common standard on new cars sold here.
How Should I Answer A Family Claim That The Old Car Did 40 MPG?
Convert it to L/100km with the imperial gallon, say the result out loud, and then ask the only question that settles family history: did anyone ever measure it at a pump? Brochure claims and notebook memories are both welcome at the table, but neither outranks one honest fill-to-fill tank.
Europe's NEDC laboratory test, the cycle behind later brochure figures, was replaced by the WLTP in September 2017 for new models and became mandatory for all new cars in September 2018; before standardized cycles, quoted fuel figures came from manufacturers' own testing with no common public standard behind them. Source: UK Vehicle Market Surveillance Unit, GOV.UK
Written By
Talha Kayani
Talha Kayani is the founder of Trivexa Digital, Multan, and the owner and developer of Ti-84calculator.com. A digital marketing specialist in SEO, social media and Meta Ads, he builds and personally tests every calculator and converter on this site before it goes live, so the figures you read here are the ones he trusts in his own daily work.
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