Join Date: Sep 2009
Location: Brownsville, TN U.S.A.
Max MPG Tips #3- Blow It Out
Historically the biggest danger to cars that are driven to max mpg has always been the build up of carbon. These cars are typically not driven in a manner that keeps the carbon from building up in the engine and exhaust system. It's the granny car syndrome. A car that is driven slowly and gently can begin to build up carbon deposits in the EGR system, the muffler, and the catalytic converter. These carbon deposits pile up over time and can be the death of a car.
How do you drive a car for max mpg yet keep it cleaned out? Blow it out.
This is a very unscientific process to be repeated every three or four months based on every 5,000 - 6,000 miles. It's very simple.
1. Drive max mpg as normal up to the 1/4 mark on the fuel gauge. Write down your avg mpg result at that point like you normally would at fuel up.
2. Switch your display OFF of your instant mpg setting. Why? Well, the rest of this tank does not count.
3. Drive in an aggressive manner the rest of the tank. I say aggressive because if you drive for max mpg your idea of aggressive is everyone else's idea of normal. You want hard acceleration up to speed, jackrabbit starts, etc. The purpose is to literally blow the built up carbon out of the tail pipe.
4. Refuel and go back to your max mpg driving. You will take a hit on your fuel range when you fill up again, but it's worth it to make sure that you keep that exhaust system clear. A plugged cat can be very expensive, and damage an engine.