# Re: yes, it's a mileage thread

XS11E wrote:

It has no effect if mileage is measured as I prefer to do it, I keep a log of gas purchases with date, number of gallons, odometer reading and amount paid.

After a year I can calculate mileage and have a *real* figure. Less than a year isn't accurate because of changes in wind, weather, how full you get the tank, different types of driving and, as you say, changes in fuel. People who figure mileage after one fill up have to realize that that is very likely an unreal number valid only for that one tankful.

Note that by keeping score of the price I can also calculate cost/mile but I stopped doing that when it got really scary...

There's another way to figure gas mileage, I learned it from a VW mechanic and it works very nicely! I asked how some got 30+ mpg when I couldn't, he said, "They lie about it!" Nothing will improve your mileage as much as lying about it will! ;-)

Are they talking about highway MPG or their average? I don't think I have ever met anyone who claimed to average 30+ MPG in their Miata.

The best I have ever gotten in any Miata is 33 MPG on the highway under mostly-ideal conditions, with a lot less in town.

The way you are measuring is great for a year-round average, but it does not show the difference between city and highway driving. I never drive off an entire tankful without highway driving, so I have only been able to measure it at all in town by filling it up, driving down a gallon or two and then re-filling and doing the math.

Not completely accurate, I agree, but it is certainly more accurate for a city/highway difference than trying to figure out how many of the miles are city and how many are highway over a period of a year.

I don't really want to admit how low my in-town mileage can get in my current turbo Miata. ;-)

On the highway I have driven about 330 miles, then refilled it with around 10 gallons of gas.
The math told me that I was getting 33MPG, and I trust it within a gallon or two. This was in my 1996 Miata, since I haven't measured my MPG in over 5 years.

I would be very surprised if your 1992 Miata is not capable of getting over 30MPG on the highway.

Pat

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