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Re: MPG Computer is jumping all over the place Is this...
When you let off the gas it should climb upward rapidly. 53..200.. then go blank. If it is as you say then a minute between jumps is normal as dimebar123 stated. If it is changing from 16 to 99 and you have the gas down and are going up hill. I'd have it looked at.
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Depends on miles per gallon of vehicle. Average mpg of say 15 mpg would take 15 gallons to travel 225 miles.(15x15=225). At $2.29 per gallon @15 gallons=$34.35. So figure out mpg of your vehicle and do the math.
The DTE is automatic and is the result of your previous miles per gallon multiplied by the gallons of gas registered in your tank.
Unlike the Trip miles, this DTE number can not be reset. It will vary by the fuel mileage per gallon recorded at each startup. That is why if you filled the tank and showed 400DTE you may have had 20 Gallons multiplied by 20 MPG. But if your new average is 16 MPG then it would show 320 DTE.
One tank of gas is not enough to compare mileage. Or are you saying the computer's readout of mpg estimate is showing less? Try a tank or two of premium and see if that helps. Keep track of gas mileage. Driving techniques have a lot to do with gas mileage, as does long trips vs. short trips, highway cruising vs. city driving. For best mileage, do regular maintenance and keep the car in top running condition-good spark plugs and clean filters and clean oil ! Attend to minor problems before they escalate. If you want to check actual miles per gallon, start with a full tank. Write the odometer reading down, and go. Everytime you put gas in, write down the amount. When you are close to 1,000 miles from the time you started, go fill the tank and include that amount of gas to your previous list. Now add up all the gas used and divide it into the miles to get miles per gallon. (976 miles/31.8 gallons = 30.69 mpg ) . Only one tank will skew your numbers, might be off cause the tank was filled more to the top than the previous fill-up. About a thousand miles of driving will give you a very accurate figure of miles per gallon for your car.
About 11 MPG. I had to convert KM to Miles. Of course this is for "highway" driving without a lot of stops and starts. I didn't find any information on city driving, but I would guess that it would be around 8 MPG.