Fuel log and mileage tracking app for Android

I would like fuel economy to calculate off of the GPS Trip Log.
First of all, this app is great! I love it and it is very useful to keep track of car expenses across multiple vehicles. I am genuinely surprised it is a free app and not a $10 one off buy or similar.
My suggestion is I would like the option for fuel economy to be calculated off of GPS distance from the automatic Trip Logs. I would also like the option for fuel economy to be applied backwards to between the last time the tank was filled and now.
My car is a 4wd with over-sized tires. I know from experience that when my speedometer in the car reads 100km/hr, I am actually traveling at 107km/hr based off of GPS speed. Going by this then, if I fill my 60lt tank after 450km based on the car odometer reading, the fuel economy looks like 60/4.5 = 13.3 litres per 100km. But if I calculate economy off of GPS distance it is actually 60lt per 481.5km 60/4.815 = 12.46 litres per 100km.
Odometer Distance 13.3 litres / 100km vs GPS Distance 12.46 litres / 100km.
That is almost a 1 litre per 100km improved economy and is actually more accurate.
This isn't so much a big deal when city driving, but when out on 4wd tracks, I am often gone out for 2 or 3 days at a time. On tough trips I drive in low range so the fuel usage is a lot more. And my my tires are slipping in mud, or sand or on other loose surfaces which in this case, the odometer reading may show I have travelled a lot further than the GPS distance.
In this case, having the GPS distance calculate fuel economy is also much more accurate. It would also be more beneficial when I fill up next to be able to apply the GPS calculated fuel economy to all the trips I made between the last full tank and now when I fill up.
I know these are very specific details and requests compared to what most users are suggesting but if it could happen this would be amazing.
Thanks.

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Different Colors for categories
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Round off or round up mileage
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Cannot import csv from different device
I have read many threads about this and not found any resolution that works for my existing problem. I have sold my car to my nephew and I would like to start him up with Fuelio and include the 4 years of data I have been entering. I "Export" and the csv file appears on my google Drive at:
/Android/Fuelio/backup-csv
The complete file name:
"/Android/Fuelio/backup-csv/car3-20220606-061454.csv".
There are other previous backups, similarly named, in that same folder(directory).
I can pull this file down and work on it in my spreadsheet on my desktop PC. I have provided my nephew with the csv file (on his phone), but that doesn't help because Fuelio will not import from a local directory. I have sent him the Drive link (and given him access to the "...backup-csv dir) and he has placed (copied) the file on his Drive in the appropriate directories, but receives and error when (from within Fuelio on his phone) he tries to "Import" the file. He can _export_ a test car from his Fuelio (with only a couple lines of mileage data) and that test file appears in his Drive directory alongside the "car..." file with the real data. But he cannot import the real file.
We have tried various renaming tricks, copying tricks, anything we could think of, with no success. This seems really basic stuff and it's very disappointing to run into this blank wall after using Fuelio for years and recommending it frequently.
I hope somebody can suggest a kludge that actually works, but I would _really_ like to see the "Import" just work like it should when pointed at a properly formatted file - located anywhere - but most especially located in the dir where Fuelio has just exported (and imported back) another file properly. Especially when Fuelio itself has produced the target file. And it seems like total no-brainer to be able to import local files from storage anywhere on the device itself.
Thanks for any help.
Rufus

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01-12-2021 Maintenance
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It would be easier to be able to tap the nearby stations preview shown below it.
Same thing for Gas etc.
The title of each sections could be merged with the preview so that it's clear that be can tap either one (and so that it's clear which title is related to which preview)
Current layout:
Suggested layout:
Kundesupport af UserEcho