Originally Posted by jparker070
I had a question about the fuel efficiency gauge. When i start my car the needle is on the negative side of the gauge. Whenever I give the car gas the needle stays towards the negative side. When i let off the gas, the needle goes to the positive side of the gauge. Doesn't it mean you are saving gas when the needle is on the right side?
The fuel efficiency gauge is kind of a moving target. The mid-point is always your current
mpg average. For example, if your electronic gauge says you're averaging 32mpg, then the mid-point of the analog gauge is 32 - above and you're doing better, below worse. If your gauge said you were averaging 27, then above would be above 27, below, below 27. When you start out it'll be below mid-point due to the engine being cold/warming up. Once you've been driving a few miles it'll tend to be on the higher side; when you accelerate it'll drop below mid-point as you are using more gas.