The Updated 2010 Reliability Grade Point Averages and Grades for Manufacturers of Automobiles: The Complete Table
and the Top 5 Automobile Manufacturers and the Bottom
5 Automobile Manufacturers
by James Bleeker
Photograph of a 2008 Toyota Corolla S on 20 August 2010
|With an overall 2010 Auto Reliability Grade Point
Average of 3.81 over a 10-year data history, the Corolla
continues to contribute to Toyota Motor Corporation's
high age-range and overall Grade Point Averages. See the
table, bar graph, and list of the Top 5 below.
The Complete Table
This page provides detailed 2010 auto manufacturer reliability
ratings and auto manufacturer reliability rankings in a reorderable table. It
expresses the automobile manufacturer reliability ratings and automobile
rankings, and makes available manufacturer reliability comparisons and
reliability contrasts, using the Auto Reliability Grade Point Average, or
Auto Reliability GPA. This auto reliability index is valuable as it is an
easy-to-understand, but detailed, auto reliability measure, and is familiar
to many having attended secondary school and nearly all who have received
some post-secondary education. The page also employs Auto Reliability Grades
as a reliability index. This measure of auto reliability differences,
although less detailed, is valuable as it is familiar to all persons having
attended primary school. The updated Auto Reliability GPA is an automobile
reliability statistic that is obtained from Consumer Reports' auto
reliability survey data summarized in the reliability tables of (1) Consumer Reports: New Car Buying Guide: 2010,
(2) Consumer Reports: Used Car Buying Guide: 2010, and
(3) the April 2010 issue of the Consumer Reports magazine. Column
reordering on this page is Ajax
enabled to make for a convenient and easy-to-use reordering option.
GPA for each car manufacturer is the average of the
Average GPAs of its models. The Average
Minimum GPA for each car manufacturer is the average of the
Minimum GPAs of its models. The Reliable
Two, Toyota Motor Corporation and Honda Motor Company, appear first in the
table, because of their rather singular stature; the remaining manufacturers
are listed alphabetically.
Letter grades corresponding to Average GPAs and Average Minimum GPAs are determined thusly: A if the GPA is 3.50 to
4.00, B if the GPA is 2.50 to 3.49, C if the GPA is 1.50 to 2.49, D if
the GPA is 0.50 to 1.49, and F if the GPA < 0.50.
GPAs for 4 age ranges are given so that the visitor may
examine more thoroughly the age range that is of greater interest to
him/her, if such there be.
To arrange any column in ascending order
(smallest value on top), click the header of the column.
Arranging a reliability GPA or Grade column in ascending order
will place the lowest reliability values and least reliable
auto manufacturers at the top (after those with empty cells) and the highest
reliability values and most reliable auto manufacturers at the bottom of the
table. This automobile manufacturer ranking will permit the visitor to
better visualize auto manufacturer differences. The reliability ranking feature is
Ajax enabled for ease of use.
rearrange any column in descending order
(largest value on top), click the header one more time.
Arranging a reliability GPA or Grade column in descending order
will place the highest reliability values and most reliable
auto manufacturers at the top. Lists below the table give (1) the
5 most reliable auto
manufacturers and (2) the 5 least reliable auto manufacturers.
The following bar graph depicts the 2010 Auto Reliability GPAs
of the above automobile manufacturers.
There are several important points to be noted from the above
bar graph. The first is that the 2010 Auto Reliability GPAs of
Toyota Motor Corporation and Honda Motor Company are much higher
than the 2010 Auto Reliability GPA of any other manufacturer. The second is that the 2010 Auto Reliability
GPA of Ford Motor Company and Hyundai Motor Company are
indistinguishably close. The third is that the 2010 Auto
Reliability GPA of the Ford Motor Company is much higher than
those of its Detroit brethren - General Motors Corporation and
The 2010 Top 5 Automobile Manufacturers
Next, we list the 5 most reliable automobile manufacturers. The
2010 Top Five auto manufacturers are:
Toyota Motor Corporation, with
an overall 2010 Auto Reliability GPA of 3.49,
Honda Motor Company, with an overall 2010 Auto Reliability
GPA of 3.35,
Fuji Heavy Industries Ltd. (Subaru), with an
overall 2010 Auto
Reliability GPA of 2.61,
Mitsubishi Motors Corporation, with
an overall 2010
Auto Reliability GPA of 2.60,
Nissan Motor Company, with an overall 2010 Auto Reliability GPA
Note that Fuji Heavy Industries, Ltd. is a distant third, and
that Fuji, Mitsubishi Motors Corporation, and Nissan Motor
Company all have similar 2010 Auto Reliability GPAs.
The 2010 Bottom 5 Automobile Manufacturers
Next, we list the 5 least reliable automobile manufacturers. The 2010 Bottom
Five auto manufacturers are:
Land Rover, with
an overall 2010 Auto Reliability GPA of 0.13,
Isuzu Motors Ltd., with
an overall 2010 Auto
Reliability GPA of 0.83,
Chrysler LLC, with
an overall 2010 Auto
Reliability GPA of 1.08,
General Motors Corporation, with an overall 2010 Auto Reliability
GPA of 1.35,
Jaguar, with an overall 2010 Auto Reliability GPA of 1.42.
Note that both of Ford Motor Company's Detroit brethren,
General Motors Corporation and Chrysler LLC, remain in the
The Reliability GPAs of both General Motors and Chrysler suggest that one
or two additional bankruptcy reorganizations may be in the offing for one or
both. However, this largely depends on the rate of information dissemination
and the speed with which people act on the information gathered. More likely
than not, GM and Chrysler will be able to limit market share loss to one
percentage point or less per year. At this rate, both should be able to
comfortably downsize without causing economic disturbance in the U.S. or
||Site manager is currently a
very small shareholder of Ford Motor Company (2010-04-27). I am not,
and have not been, a
shareholder of any other motor vehicle manufacturer.
||Although this site was created using software by Microsoft,
you may encounter difficulty in downloading a PDF file from this
Internet Explorer. However, with Mozilla Firefox, there should
be no difficulty, and the download should be speedy.
The method of computation of the GPAs is probably familiar to nearly
every college, technical school, and high school student. A Grade Point of 4.00 (that is, an A) is given to a Consumer Reports
"Much Better Than Average" rating, a GP of 3.00 (that is, a B) is given to a
CR "Better Than Average" rating, a GP of 2.00 (that is, a C) to an "Average"
rating, a GP of 1.00 (that is, a D) to a "Worse Than Average" rating, and a
GP of 0.00 (that is, an F) to a "Much Worse Than Average" rating. A Grade
Point Average (GPA) is an average of the Grade Points and is computed using
Microsoft's Average(a:b,[c:d],...) function.
The table is an immediate import from Microsoft's Access and a more
distant import from Microsoft's Excel. The integration of the Access
database into Microsoft's Web Expression software makes the reordering of
the columns a rather simple task. For Ajax's partial post back, the
ScriptManager and UpdatePanel controls were inserted by dragging; <ContentTemplate>
was manually inserted into the code immediately after the ScriptManager and
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