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Just providing an update. I started this post to highlight the initial difference between the real world mileage vs the dash calculated mileage. After my initial 2500km the dash was reading 0.2654l/100km or 1.44 MPG lower than my actual calculations. I am now at over 15000km and the situation...

A very good point. I don't think it is as bad as all that myself. Mechanical/electrical systems like you see on pumps are much more reliable than years ago. Are they perfect? Obviously not and there may be some discrepancy, but I used brand new gas station for a while on my last car and it...

Mine is blue and I find that it helps subtly light my cup holders when it's dark.

This will show you how my car has done in the first 10K including the accuracy of the dash compared to calculated L/100Km (MPG).

Here is a site I order from all the time, a little too expensive for my taste...

Except the oil level will automatically be lower when the engine is running and that is when most leaks happen and the only time engine damage can happen. The few instances that a low oil level indicator would be helpful is too expensive to put on millions of cars an automaker may make in a...

That is not how the oil gauge works. It is a pressure gauge, while the oil pump is running it will have pressure as long as there is oil at the inlet. That is, until the pump sucks air from the level being too low (usually 1 liter). Car makers could put in another sensor for oil level, but...

Just an update, after 10 fill ups and over 5700km the difference between my dash mileage and my actual mileage has stayed steady at aprox. 0.25 l/100km (about 1.5 mpg). That means, by my calculations, that my dash is off by 3.9 percent.

Escalate any results from the dealership to Honda Canada. They need to be kept in the loop because the dealer will just bury it.

On top of all of the other comments, I would demand an independent oil analysis for every oil change while the car is under warranty. The results should indicate wear, damage or excessive particles in the used oil. If they won't do it, then do it yourself so you have verifiable proof if you...

The problem with offering up your comparisons on one tank of gas is the variables, did you fill it up to the exact same level as every tank? Pumps will "click" off at different times for different pumps, how level are the pads if you are using different pumps, temperature, etc. If you get...

I like the consistency, makes it easier to trust your data but it also limits the accuracy to a narrow range.

Were your dash readings always right or did they improve after the first month? My only problem with my data is how small the sample is, I'm not sure if the break-in period is throwing it off.

Perhaps I'm not understanding you fully but how can the odometer be inaccurate? I know of no other system that would be any more accurate. Gps has an accepted Global Average User Range Error for coverage and then is influenced by signal blockage by trees, buildings, tunnels, covered...

TL;DR - Dash mileage is inaccurate by 4%. That means it's off by 1.35 to 1.45 MPG. Hi, I'm new to the site and new to my Civic, previously I drove a 2012 Focus from new. I recorded all of my fill up data religiously and being a bit of a statistics geek, I created a spreadsheet that tracked...