Fuel Gauge/ MPG issues


Hello everyone. I recently brought a k11 and for the price and age im very impressed. Im just wondering if its normal but fuel was at 3/4 when i brought it. After driving home it went slightly down but back up to just barley touching the 3/4 icon. This was 8mile drive. I then took it out again 2 miles and it dropped every slightly again. So between the 3/4 icon and icon below (not 1/2 icon) between the 2 icons roughly about 85%. Went to go home and it dropped to around 40% then driving home again to 20% between the 2 icons. So basically every nudge on the fuel gauge im getting around 20miles. 150 miles on a full tank on that theory.
Sorry if its abit confusing but cant figure out to attach a picture.
Is it dodgey fuel gauge or just take no notice of the fuel gauge?
Any advice please
Thank you
 
Yeah probably the fuel gauge is acting weird. If the car its running good you should get at least 300-350 miles.
Check for any obvious leaks under the tank or engine bay area while the car is running or even when parked.
You could pack a fuel can on your car and see how far you can go.
 
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