I thought i had read the Computer would make your MPG off to the positve so if it says 50 im actually getting about 46-47. However on my V im getting the other way. 3 fill ups now 1 of them going all the way to no pips on the screen and car saying 0 miles ( still only put 9.98 gal in). Anyway all 3 times the car reads 48-51. However when i calculate the miles driven and the gal i put in. Filling at the same gas station the last 2 times and going to 2 clicks i am getting 3.5-4MPG better then what the car says. Why would this be? Should i be worried my speedometer is off or something which is causing it show the wrong miles? the wheels are stock and tire size is stock for the 17IN. Thanks guys.
No worries. Over 38000 miles I find about a 5% error in computer and hand calculated mpg. At 50mpg computer this figures to 2.5 miles less when hand calculated. No worries, computers are not perfect
To calculate your MPG, the computer basically takes the distance you have traveled divided by the amount of gas went into the engine. The computer itself is super accurate when comes to doing the math. However, the sensors or the devices that measure gas volume and distance are not 100% accurate. In addition, I believe that outside temperature would affect the accuracy of gas volume measurements.
