New Class C, change driving and fueling habits?

jeffengle wrote:
What is the top transmission gear ratio, is it more than 1-1? If you have to use a fuel additive, that changes your cost of mpg. If you put taller tires on , that changes your speedometer reading.

When different size tires are put on the speedo needs to be re calibrated. Most don't do that and then the true MPG is off so now they think they are getting worse/better mpg...

Taller tires speedo reads slower and miles add up less.
Smaller tires speedo reads faster and miles add up faster.