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STV3

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Driving home from Vermont to NY with a big mountain bike on the roof.

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Professor SKO

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You really need to calculate MPG over a whole tank of gas. Short trips or even a couple hour trips are really only going to show a very small percentage.

Miles ÷ gallons of gas = MPG
That is the correct equation for calculating MPG IF you filled your tank to the same level as you started out at, ie if you had a full tank of gas to start and didn't fill it up all the way when you completed your trip, then your calculation isn't correct because it doesn't indicate the number of gallons you used. For instance, I travel 150 mile and only put one gallon of gas in the tank rather than the 4 gallons I could have fill the tank with, then my MPG would appear to be 150 MPG rather than 37.5 MPG. The opposite can also happen. You don't fill the tank before you start, ie you already used 5 gallons of gas, but when you fill up your tank immediately after the trip, you put 10 gallons of gas in, then 150/10 = 15 MPG apparently. If you take a long trip and fill up the tank just before the trip and immediately after the trip and put in gas at a couple of other stations, then add up all the you put into the tank and then do your calculation, it will give the most accurate result.
 

concept

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When someone asks me what gas mileage I get, I will not exaggerate by telling him the highway mileage. I guess some owners live near a highway and experience no traffic, but that's not the average Supra owner. I may be getting 30+ mpg on a long cruise with no traffic, but my average mpg is 23, which includes full throttle over short distances.
That's what I would tell anyone who asks. My NC Miata's average is probably 25, so the B58 is still impressive, given the power difference and weight of each car.
 

razorlab

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That is the correct equation for calculating MPG IF you filled your tank to the same level as you started out at, ie if you had a full tank of gas to start and didn't fill it up all the way when you completed your trip, then your calculation isn't correct because it doesn't indicate the number of gallons you used. For instance, I travel 150 mile and only put one gallon of gas in the tank rather than the 4 gallons I could have fill the tank with, then my MPG would appear to be 150 MPG rather than 37.5 MPG. The opposite can also happen. You don't fill the tank before you start, ie you already used 5 gallons of gas, but when you fill up your tank immediately after the trip, you put 10 gallons of gas in, then 150/10 = 15 MPG apparently. If you take a long trip and fill up the tank just before the trip and immediately after the trip and put in gas at a couple of other stations, then add up all the you put into the tank and then do your calculation, it will give the most accurate result.
Of course the equation is gallons of gas used. Use some common sense people.
 

PInimodulo

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That is the correct equation for calculating MPG IF you filled your tank to the same level as you started out at, ie if you had a full tank of gas to start and didn't fill it up all the way when you completed your trip, then your calculation isn't correct because it doesn't indicate the number of gallons you used. For instance, I travel 150 mile and only put one gallon of gas in the tank rather than the 4 gallons I could have fill the tank with, then my MPG would appear to be 150 MPG rather than 37.5 MPG. The opposite can also happen. You don't fill the tank before you start, ie you already used 5 gallons of gas, but when you fill up your tank immediately after the trip, you put 10 gallons of gas in, then 150/10 = 15 MPG apparently. If you take a long trip and fill up the tank just before the trip and immediately after the trip and put in gas at a couple of other stations, then add up all the you put into the tank and then do your calculation, it will give the most accurate result.
On that note, the best way to do it is to fill up the car on a specific gas station and specific pump, let it fill until it stops automatically and dont fill anymore. Then when you decide to fill again and measure, fill it on the same station and pump and again let it fill until it stops automatically. Then of course you see how many gallons went in and how many miles you were able to go with them.
That would be the most "accurate" you can do it on a gas station.
 

FLtrackdays

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That is the correct equation for calculating MPG IF you filled your tank to the same level as you started out at, ie if you had a full tank of gas to start and didn't fill it up all the way when you completed your trip, then your calculation isn't correct because it doesn't indicate the number of gallons you used. For instance, I travel 150 mile and only put one gallon of gas in the tank rather than the 4 gallons I could have fill the tank with, then my MPG would appear to be 150 MPG rather than 37.5 MPG. The opposite can also happen. You don't fill the tank before you start, ie you already used 5 gallons of gas, but when you fill up your tank immediately after the trip, you put 10 gallons of gas in, then 150/10 = 15 MPG apparently. If you take a long trip and fill up the tank just before the trip and immediately after the trip and put in gas at a couple of other stations, then add up all the you put into the tank and then do your calculation, it will give the most accurate result.
Honestly I just hit the reset MPG button if I wanted to know. It’s especially fun to do on track ?

Not what I bought her for. However, it does get shockingly more MPG than I expect on the highway.
 

concept

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It makes Corvette guys feel better to pretend like they aren't getting 18 mpg.
I used to average 17 in an 01 that had about 320 hp at the wheels. I'm sure very few 3.0 Supra owners average 30+ mpg.
If I were that kid in the video, I'd have responded with "Really, you average that much? You must have a 2.0."
 

Kujiwara

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I did a trip from Vancouver BC to Mt Baker in Washington last weekend and avgd 10.5L/100km, which is 22.4mpg, consisting of the following over a 200 mile trip
3 hours of crawling at the border
70 miles of spirited driving from the border all the way up to the peak of Mt Baker, 80% of the time there was no traffic so really got to open it up
Calm traffic following from the Peak all the way down to Bellingham
Calm highway cruising around 85mph from Bellingham back home
Smiled the whole way driving, smiled at the gas pump, very impressed

10.4L/100km (22.4mpg) is the average economy I got during the entire ownership so far over 10k km since new. 2 autocrosses, 1 track day, lots of spirited drives, lots of normal daily activities.
 
 








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