Here's a great starter. I've been driving for a loooong time and never knew this, e-mailed to me yesterday. On which side of your car is the fuel filler? I'll bet you didn't know the fuel gauge tells you. Bottom left pic, it's on the left. Bottom right pic, on the right. Now someone spoil it - and tell me it's wrong.
There are little 1/4 inch triangle marks on the edge of your (UK/europe) tyres that point to where there are raised sections of rubber between the tread that are depth markers to show excessive tyre wear.
Bugger! Two cars outside are different and both work, but I agree with Dingo, it makes more sense as being a picture of what the bowser should look like as you pull up to it. Never mind. Anybody with really useful stuff.
There is a theory that many fuel fillers are situated on the opposite side to the car exhaust pipe. So if in doubt, check which side the exhaust is mounted, and look for the fuel filler on the other side!
(This may of course be very confusing for drivers who own cars with twin exhausts)
a_a Easier still: add as decimals 1.55 + 1.35 + 1.45, but keep an eye on the result each time and add .40 (40 minutes) every time the sub-total exceeds .60 (equivalent to the next hour). So: 1.55 + 1.35 = 2.9 so add .40 = 3.30 (3hrs 30 mins); add 1.45 = 4.75 so add .40 = 5.15 = 5hrs 15 mins. Piece of doddle. The RAF was doing this when the first Sinclair pocket calculator came out in the early 70s (@ £100 IIRC).
....or an old Jag XJ6 with twin fuel tanks and filler caps.
a_a Your trick works because you get your total in the format hmmm. i.e. hours = 1000s, and minutes are the next three digits. You then rearrange that number by adding 1 hour and taking off 60 minutes (1000 -60 = +940) until the minutes get less than 60.
Zoom does the same thing using 3 digits. 1 hour (1.00) - 60 minutes (.60) = +.40
Thought you would like to know.
(I hate people so smart with numbers!)
I drive two cars and the filler caps are on different sides so I always forget which side of the pump to go to. If you pull the pipe over the top of the car you can guarantee that half a litre of petrol pours out and ends up your sleeve or over your shoes.
Sorry Folks Just looked at title of thread and I guess this is not 100 VERY useful things to know.