Probably the same reason we have three IARU regions that do things differently. It has always been done that way, and real change doesn’t come until the last dissenters pass away.
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But you need to remain clear of cloud to maintain VMC (visual Met conditions), that distance between your aircraft and the edge of the cloud (undefined) is measured in (nautical) miles.
For a feast of conversions between various standards, watch the videos by the Missionary Bush Pilot on YouTube where he adds up the cargo and passenger load in one standard and inserts that into the calculator on his front panel then see it all convert to pounds or kilos and result in a recommended takeoff speed in knots. Similar for landing, taking account of humidity, temperature, plane mass and headwind component in knots and direction (magnetic). Aircraft fuel is also measured in pounds. I think we will achieve negative CO2 growth before this mess is sorted.
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Litres to (imperial) gallons ratio is 4.55 which is easy to remember for obvious reasons.
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Working in engineering in the states using FPS (foot pound seconds) was hard work after only ever being metric. pounds force and pounds mass and g = 32.174 ft/s² 
Every industry has its weird units “for historical reasons”, eventually you get used to them but boy is is confusing at first. “How should we measure energy in steam?..I know use a flowrate of cold water equivalent for a specific temperature and pressure (that’s different from actual conditions)” Oh yes…obviously…
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For those of a certain age, IF you know what I mean… 
Of course all this imperial - metric interpolation is automatic for many of us that went through the change and are conversant with both systems. I drive in miles and walk in kilometres, but a sneaky sub-set of data always has me roughly converting my walk distances to miles. 
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The most annoying thing in my VW is it tells me how much Adblue I can add in gallons. It comes in metric containers.
We aren’t even consistent there. Bottles of beer are 500mL (or 330, 440…).
My milkman delivers milk in 2L plastic bottles. I wonder how many people have been to the corner shop to buy a 4 pint bottle of milk and accidently bought only 2L.
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A perfect “shrinkflation” tactic. Although I’m sure some supermarkets are more honest that others…
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Yes, i was tempted use that one too. But you saved the day with an intermediation.
Thanks Gerald.
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Mine is in litres but getting the size of the tank is hard work… must be an official secret. I’d driven nearly 18000miles before it told me I could add more. I think it’s about 17L. With 35000miles driven I’ve added 15L and it doesn’t want more at the moment.
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I could send you my Steam Tables if you are confused 
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I had to research mine as well… I think it is 23 litres. The system first asks for a fill of 6 litres, then 8 litres which is when I top up, but I think I can leave it until it asks for 10 litres which would be more convenient. It uses 1 litre every 800 miles which seems okay in combination with 48mpg average fuel consumption. It’s considerably more economic than the old motor. I particularly like the 660 mile typical range… 703 miles on one occasion.
I can change the electronics to fully metric… to be expected of a vehicle manufactured in the EU I suppose. All I need is the opportunity to get over the channel. 
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That was considerate/unsual for a German car manufacturer.
The diesel in our fleet was built long before such things (Adblue). It will run on chip oil, diesel, blended owls or bitumen.
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Does it need to be those species or is that just your preference?
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Helps his miles per hoot stats.
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Listen my ribs are still sore. Normal activity is fine apart from big coughs and riotous laughter. Blended owls is plenty funny enough on its own without the snarky micky-taking banter. I’m off in search off painkillers.
When I was at uni, a fellow student had a Land Rover Safari petrol. Even when petrol was under a £1/gallon it was an expensive vehicle to run. It had a long range extra fuel tank installed and that was filled with paraffin. You started the car on petrol to warm it up then switched to petrol /paraffin mix on which a petrol LR engine was happy to run. Well it was a bit rough on idle but acceptable when petrol was 98p/gallon and paraffin was 15p/gallon.
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When I was in the Sea Scouts (not yesterday !) we had an outboard engine that ran on petrol/paraffin. Petrol at idle, paraffin at high revs. I seem to remember it was meant to be TVO (tractor vapourising oil) which was coloured green.
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I was in LA for work a few years ago and the taxi driver was having a complain about how expensive “gas” was. The prices on the pumps looked pretty reasonable to me. Then I realised that was the price for a gallon. So they were actually 3.78541 times more reasonable.
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