Methods and systems for monitoring of motor vehicle fuel efficiency

1. A method for tracking fuel economy across a plurality of vehicles in a fleet of vehicles by a computer that is remote from the vehicles, comprising the steps of:

(a) receiving fuel information from a radio frequency (RF) interrogator corresponding to a quantity of fuel pumped into a first vehicle;

(b) receiving a current odometer reading from the RF interrogator corresponding to a current reading for an odometer associated with the first vehicle;

(c) determining a previous odometer reading received for the odometer associated with the first vehicle, the previous odometer reading corresponding to a previous fueling of the first vehicle;

(d) calculating a distance traveled by the first vehicle since the previous fueling as the difference between the previous odometer reading and the current odometer reading;

(e) calculating a fuel economy for the first vehicle as the ratio of the distance traveled and quantity of fuel pumped into the first vehicle;

(f) recording the fuel economy and current odometer reading for the first vehicle; and

(g) repeating the steps of (a) through (f) for the first vehicle and a plurality of other vehicles of the fleet of vehicles.

2. The method, as claimed in claim 1 , wherein the step of receiving fuel information comprises:

firstly interrogating, with a RF interrogator, a wireless fluid flow meter and reading a first value corresponding to total fluid that has flowed through the meter;

transmitting the first value from the RF interrogator to the remote computer;

filling the first vehicle with fuel;

secondly interrogating, with the RF interrogator, the wireless fluid flow meter and reading a second value corresponding to total fluid that has flowed through the meter;

transmitting the second value from the RF interrogator to the remote computer; and

computing the quantity of fuel pumped into the first vehicle as the difference between the first and second values.

3. The method, as claimed in claim 2 , wherein the wireless fuel flow meter comprises:

a meter that measures a quantity of fluid that is dispensed from a pump;

a processing unit that is operably interconnected to the meter and receives fluid quantity information;

a radio frequency (RF) transmitter operably interconnected to the processing unit and operable to transmit fluid quantity information; and

a self-contained power supply that provides power to the meter, processing unit, and RF transmitter.

4. The method, as claimed in claim 1 , wherein the step of receiving a current odometer reading comprises:

interrogating, with a RF interrogator, an odometer and reading a current value corresponding to total distance recorded by the odometer that the vehicle has traveled; and

transmitting the current value from the RF interrogator to the remote computer.

5. The method, as claimed in claim 1 , further comprising, after the step of recording:

(h) secondly receiving fuel information from a RF interrogator corresponding to a second quantity of fuel pumped into the first vehicle;

(i) setting the current odometer reading as the previous odometer reading;

(j) secondly receiving a second current odometer reading from a RF interrogator corresponding to the current reading for the odometer associated with the first vehicle;

(k) calculating a second distance traveled by the first vehicle since the step of (a) as the difference between the previous odometer reading and the second current odometer reading;

(l) calculating a second fuel economy for the first vehicle as the ratio of the second distance traveled and second quantity of fuel pumped into the first vehicle;

(m) recording the second fuel economy and current odometer reading for the first vehicle; and

(n) repeating the steps of (h) through (m) for additional fueling events for the first vehicle.

6. The method, as claimed in claim 1 , further comprising:

tracking the fuel economy of the plurality of vehicles for a plurality of fueling events for each vehicle;

computing an average fuel economy for each of the plurality of vehicles; and

identifying deviations from the average fuel economy.

7. The method, as claimed in claim 6 , further comprising:

determining a probable source of the fuel economy deviation.

8. The method, as claimed in claim 7 , wherein the probable source is selected from a group consisting of: improper tire inflation; mechanical malfunction; and operator behavior.

9. The method, as claimed in claim 6 , further comprising:

generating an exception report indicating deviations and identifying a vehicle of the plurality of vehicles as having a deviation; and

transmitting the exception report to a user of the remote computer.

10. The method, as claimed in claim 9 , wherein the user of the remote computer receives the exception report, and may access the remote computer, via a wide area network.

11. An apparatus for tracking fuel economy across a plurality of vehicles in a fleet of vehicles, comprising:

means for receiving fuel information from a radio frequency (RF) interrogator corresponding to a quantity of fuel pumped into each of the plurality of vehicles, and a current odometer reading from the RF interrogator corresponding to a current reading for an odometer associated with each of the plurality of vehicles;

means for determining a previous odometer reading received for the odometer associated with each of the plurality of vehicles, the previous odometer reading corresponding to the previous fueling of each of the plurality of vehicles;

means for calculating a distance traveled by each of the plurality of vehicles since the previous fueling as the difference between the previous odometer reading and the current odometer reading;

means for calculating a fuel economy for each of the plurality of vehicles as the ratio of the distance traveled and quantity of fuel pumped into the first vehicle; and

means for recording the fuel economy and current odometer reading for each of the plurality of vehicles.

12. The apparatus, as claimed in claim 11 , wherein the means for receiving fuel information comprises:

an RF interrogator operable to interrogate a wireless fluid flow meter and read a value corresponding to fluid that has flowed through the meter; and

an RF receiver that receives information from the RF interrogator.

13. The apparatus, as claimed in claim 11 , further comprising:

means for tracking the fuel economy of the plurality of vehicles for a plurality of fueling events for each vehicle;

means for computing an average fuel economy for each of the plurality of vehicles; and

means for identifying deviations from the average fuel economy.

14. The apparatus, as claimed in claim 13 , further comprising:

means for determining a probable source of the fuel economy deviation.

15. The apparatus, as claimed in claim 14 , further comprising:

means for generating an exception report indicating deviations and identifying a vehicle of the plurality of vehicles as having a deviation; and

means for transmitting the exception report to a user.