Fuel Mileage Conversion Chart – FIXED!

Something that’s vexed me for a while, which I finally decided to compute:

UK mpg US mpg km/l l/100km
5.00 4.17 1.77 56.50
10.00 8.33 3.54 28.25
15.00 12.50 5.31 18.83
20.00 16.67 7.08 14.12
25.00 20.83 8.85 11.30
30.00 25.00 10.62 9.42
35.00 29.17 12.39 8.07
40.00 33.33 14.16 7.06
45.00 37.50 15.93 6.28
50.00 41.67 17.70 5.65
55.00 45.83 19.47 5.14
60.00 50.00 21.24 4.71
65.00 54.17 23.01 4.35
70.00 58.33 24.78 4.04
75.00 62.50 26.55 3.77
80.00 66.67 28.32 3.53
85.00 70.83 30.09 3.32
90.00 75.00 31.86 3.14
95.00 79.17 33.63 2.97
100.00 83.33 35.40 2.82

You can see why the metric standard tends to be “litres per 100km” since the numbers are rather fine-grained for km/l.

6 Replies to “Fuel Mileage Conversion Chart – FIXED!”

  1. re: Fuel Mileage Conversion Chart

    Your calculations are not correct, 30 US miles per gallon is 7.84 l/100km, verify with “units” (the GNU one, the solaris version is not as good)

  2. re: Fuel Mileage Conversion Chart

    I’ll look into it; the figures were generated by a perl script where I used British Gallons as a base:

    #!/bin/perl

    foreach $brmpg (1..20) {

    $brmpg *= 5;

    $usmpg = $brmpg * 1.2009524;

    $kml = $brmpg * 0.35400547;

    $miles_for_100km = 62.137119;

    $gallons_for_100km = $miles_for_100km / $brmpg;

    $l100km = $gallons_for_100km * 4.5460993;

    printf “%.1f ! %.1f ! %.1f ! %.1f\n”, $brmpg, $usmpg, $kml, $l100km; }

    …maybe there’s a typo or other goof.

  3. re: Fuel Mileage Conversion Chart

    and the conversion figures came from MacOSX units.

  4. re: Fuel Mileage Conversion Chart

    100km is 62 miles nearasdammit, so I fed that into the algorithm and got:

    62.00 ! 74.46 ! 21.95 ! 4.56

    …so if I do 62 UK-MPG I will consume 1 gallon for 100km.

    1 Gallon = 4.5n litres, so that’s 4.5 litres / 100km, which matches the 4.56 it calculated.

    What figure do you make that out to be?

  5. re: Fuel Mileage Conversion Chart

    You wrote that $usmpg = $brmpg * 1.2009524;

    US Gallons are smaller than Imperial Gallons. You should divide, not multiply here.

  6. oops

    This is what I get for coding without coffee; i’ve updated the table above. Thanks, Mike!

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