The Head Gasket is part of the car engine system. We have 2 associated problem symptoms connected to it.
When putting your foot on the accelerator the car does not respond with the same urgency of acceleration. It feels like there is a lag between putting your foot down and the car accelerating, when it does accelerate it feels like a much slower change in speed.
The fuel gauge seems to be going down quicker than usual, the car is using more fuel when driving in the same way as before.