Exel/DHL conducted fuel economy studies on Class 8 trucks with and without a Rentar Fuel Catalyst installed. In Lubbock, Texas, they found a 5.1% average improvement in fuel consumption on 5 trucks with the catalyst. In Lima, Ohio using a SAE Type IV study with 10 trucks, they found a 4.59% average improvement on the 5 trucks with the catalyst compared to the control group. The estimated annual fuel cost savings per truck was $2,270, resulting in $227,000 in savings for 100 trucks.

1. 1
Fuel Economy Savings Study
Testing Conducted and Data Accumulated By
EXEL / DHL
At The Penske Truck Leasing Facility Lubbock, Texas and
NationaLease Facility In Lima, Ohio
Purpose of Testing
To Track Fuel Economy With And Without The
Rentar Fuel Catalyst
Type of Testing
Five Class 8 Trucks – Baseline Vs. With Rentar Fuel Catalyst
Ten Class 8 Trucks SEA Type IV Study Using Five Control Vehicles
Date of Testing
Lubbock, Texas Lima, Ohio
Comparison Study Type IV Study
12/5/05 – 2/26/06 12/5/05 – 3/31/06

2. 2
Installation of Detroit Diesel Series 60

3. 3
Summary of Findings
Exel/DHL conducted fuel economy studies. They solely managed and
collected the data. The results are reported below.
In Lubbock Texas at the Penske Truck Leasing facility, Exel/DHL
managed the creation of a baseline, installation of the Rentar Fuel
Catalyst and collection of the “post” data. The results as
documented in the attached report due to the Rentar Fuel Catalyst
were a 5.1% average improvement in fuel consumption
improvement on five Class 8 trucks.
In Lima Ohio at the NationaLease facility, Exel/DHL managed a
SAE/TMC Type IV fuel economy test procedure using ten Class 8
Trucks. The ten vehicles were tested to establish they were all
producing a similar consumption rate. The Rentar Fuel Catalyst’s
were then installed on five of the vehicles and the other five became
the “control trucks”. The results, as documented in the attached
report were a 4.59% average improvement in fuel consumption
improvement on the five trucks with the Rentar Fuel Catalyst
installed.
The effect of using the Rentar Fuel Catalyst on the Exel/DHL truck fleet
based on each vehicle averaging 105,000 miles per year and purchasing
fuel at an average of $2.49 per gallon would be a fuel cost reduction of
$2270 per truck or $227,000 per 100 trucks annually. The return on
investment (ROI) or repayment of the cost of the catalyst would be
approximately 8 months.
Test Protocol
Lubbock Texas - Controlled Comparison Testing
Exel/DHL selected 5 similar trucks with Detroit Diesel Engines.
Beginning and ending odometer readings were taken by Exel/DHL
(Llano) Manager Lyndon Read for Phase 1 and Phase 3. Lyndon also
supplied the fuel usage for each truck in each phase. Fuel usage was
acquired from Exel’s official fuel billing records, provided by Penske,
to ensure accuracy.
The testing was conducted at the Penske Truck Leasing facility in
Lubbock Texas. The 5 trucks were driven over similar routes and in
similar weather conditions throughout the duration of the fuel
economy study. At the conclusion of the Comparison Study in
Lubbock, Texas, the fleet mileage per gallon was compared prior to

4. 4
fuel catalyst installation (Phase 1) to fleet mileage per gallon after
fuel catalyst installation (Phase 3).
Testing Timeline
Phase 1 – 12/5/05 – 1/8/06 31 Days
Baseline information was collected on 5 trucks.
Phase 2 – 1/9/06 – 1/21/06 12 Days
Break-in Period – The Rentar Fuel Catalysts were installed.
The engine was allowed to operate for 12 days before data was
taken.
Phase 3 – 1/22/06 – 2/26/06 35 Days
Data was collected from the 5 trucks that were now
operating with the fuel catalyst in place for comparison
to the baseline data.
Data was collected over 66 days during which a total of 123,954
miles were accumulated.
The fuel consumption improvement was 5.1%
Lima Ohio – SAE Type IV (Testing With Control Vehicles)
Exel/DHL selected 10 similar trucks with 2005 Cummins ISM
Engines. These trucks were randomly divided into two groups of 5.
The group that did not have the fuel catalyst installed was designated
the Control Group. The group that had the catalyst installed was
designated the Pre-Catalyst Group (prior to installation of the
catalyst) and the Catalyst Group (after installation of the catalyst).
Beginning and ending odometer readings were taken by Exel Manager
Scott Reedy for Phase 1 and Phase 3. Scott also supplied the fuel
usage for each truck in each phase. Fuel usage was acquired from
Exel’s official fuel billing records, provided by NationaLease, to ensure
accuracy.
This was an extremely large Type IV Study in that 10 trucks were
used and 289,300 miles of data was recorded. Potential variables
were accounted for and neutralized through the use of a Control
Group.
Neutralized Variables

5. 5
 weather conditions
 drivers
 routes
 loads
 trucks with 2005 Cummins ISM Engines
After the baseline MPG was established for the Control Group and the
Pre-Catalyst Group (Phase 1), it was noted that the difference
between these two groups was only .11%, or roughly 1/9th of one
percent. With this in mind, a general baseline for all 10 trucks was
established.
At the conclusion of the SAE Type IV Study (Phase 3) in Lima, Ohio,
the Mpg of the two groups (Control Group and Catalyst Group) of
trucks were compared independently to the established baseline
(Phase 1) and the slight Control Group increase was deducted from
the large Catalyst Group increase to determine the overall
effectiveness of the Rentar Fuel Catalyst. This test was conducted at
the NationaLease facility in Lima Ohio.
Testing Timeline –
Phase 1 – 12/5/05 – 1/15/06 38 Days
Baseline information was collected from the Control Group (5
trucks) and also from the Pre-Catalyst Group (5 trucks), which
would eventually have the Rentar fuel catalyst installed.
Phase 2 – 1/16/06 – 2/1/06 15 Days
Break-in Period – The Rentar Fuel Catalysts were only
installed on the 5 Pre-Catalyst trucks. The engine was allowed
to operate for 15 days before data was taken. The Control
Group of 5 trucks was untouched.
Phase 3 – 2/2/06 – 3/31/06 57 Days
Data was collected from the 5 Catalyst Group trucks and the 5
Control Group trucks to be compared to baseline data and to
each other in this phase.
95 Days of Data Collection – 289,300 Miles
The fuel consumption improvement was 4.59%.

6. 6
5.790
5.539
5.474
5.300
5.350
5.400
5.450
5.500
5.550
5.600
5.650
5.700
5.750
5.800
Mpg
1
Fleet Results
Fleet Comparison - Lima, Oh
Catalyst Fleet Control Group Fleet Baseline Average
5.116
5.372
4.950
5.000
5.050
5.100
5.150
5.200
5.250
5.300
5.350
5.400
Mpg
Pre-Test Fleet Avg. w/o Catalyst Post-Test Fleet Avg. w/Catalyst
Fleet Results
Fleet Comparison - Lubbock, Tx
Pre-Test Fleet Avg. w/o Catalyst
Post-Test Fleet Avg. w/Catalyst

7. 7
Current Exel Cost of Fuel and Estimated Savings
through use of the Rentar Fuel Catalyst
Basis of Data:
1) How many miles per truck per year ? 105,000
2) What is the Mpg? 5.47
3) What is the percentage of savings? 4.80%
4) What price per gallon? $2.49
5) What average % fuel price increase? 5%
6) How many trucks? 1,000
Gross Annual Gross Fuel Accumulated Avg. Monthly
Fuel Cost Savings Fuel Savings Savings
Year 1 $47,797,075 $2,270,361 $2,270,361 $189,197
Year 2 $50,186,929 $2,383,879 $4,654,240 $198,657
Year 3 $52,696,275 $2,503,073 $7,157,313 $208,589
Year 4 $55,331,089 $2,628,227 $9,785,540 $219,019
Year 5 $58,097,643 $2,759,638 $12,545,178 $229,070
Note: The results provided in this worksheet are estimates only, actual results may
vary.

8. 8
Exel/Penske Tests via Llano - Lubbock, Texas
Beginning and Ending Readings
For week 12/05/05 to 01/08/06
Tractor # Begin End Total Total Gallons Mpg
248592 738504 751756 13252 2629 5.041
248594 753383 764745 11362 2114 5.375
248577 669908 684241 14333 2821 5.081
414866 261304 272377 11073 2112 5.243
881596 519029 533424 14395 2975 4.839
64415 5.116
Phase 1 (Pre-Test) Fleet Mpg = 5.116
Mpg
Beginning and Ending Readings
For week 01/22/06 to 02/26/06
Tractor # Begin End Total Total Gallons Mpg
248592 757087 768194 11107 2162 5.137
248594 770583 779119 8536 1484 5.752
248577 691319 705773 14454 2906 4.974
414866 277378 287889 10511 1869 5.624
881596 539472 554403 14931 2778 5.375
59539 5.372
Phase 3 (Post-Test) Fleet Mpg = 5.372
Mpg
*The figures returned from the performance tracking in Lubbock, Tx show
a savings of 5.01% in fuel expenses due to the Rentar Fuel Catalyst.
*See Comparison Chart - Lubbock (bottom tab) for a visual of the
5.01% savings.
Exel/NationaLease Tests - Phase 3 (Post-Test)
Final Data - Catalyst Group/Control Group Fleet

9. 9
Averages - Lima, OH
Beginning and Ending Readings
For Week 02/02/06 - 03/31/06
Catalyst Group Trucks - Phase 3
Tractor # Begin End Total Tot. Gallons Mpg
315911 131258 149024 17766 3046.68 5.831
315913 115177 139172 23995 4238.23 5.662
315914 121897 140810 18913 3287.43 5.753
315915 108049 120287 12238 2031.38 6.024
315926 95513 113042 17529 3085.49 5.681
90441 5.790
Phase 3 (Post-Test) Fleet Mpg = 5.790 Mpg
*5.790 Mpg for the Phase 3 Catalyst Fleet Mpg indicates a savings
of 5.77% in fuel costs when compared w/the baseline.
Control Group Trucks - Phase 3
Tractor # Begin End Total Tot. Gallons Mpg
315903 115565 124791 9226 1657.73 5.565
315904 115002 124165 9163 1647.63 5.561
315906 106627 122796 16169 2988.04 5.411
315907 113665 129462 15797 2802.89 5.636
315910 107363 121914 14551 2635.55 5.521
64906 5.539
Phase 3 (Post-Test) Fleet Mpg = 5.539 Mpg
Exel/NationaLease Tests - Phase 1 (Pre-Test)
Baseline Data - 10 Truck Fleet Average - Lima, OH

10. 10
Beginning and Ending Readings
For Week 12/05/05 - 01/15/06
Tractor # Begin End Total Tot. Gallons Mpg
315903 93669 109529 15860 2895.15 5.478
315904 93386 108853 15467 2779.88 5.564
315906 86275 98723 12448 2344.22 5.310
315907 95272 108298 13026 2342.9 5.560
315910 92920 104087 11167 2050.7 5.445
315911 109663 123844 14181 2529.24 5.607
315913 95125 108556 13431 2476.45 5.423
315914 99693 115062 15369 2809.38 5.471
315915 89735 101569 11834 2124.58 5.570
315926 79745 90915 11170 2101.99 5.314
133953 5.474
Phase 1: Baseline Data Fleet Mpg = 5.474 Mpg
*See Comparison Chart - Lima (bottom tab) for a visual of the
savings.
*The above 10 trucks all run on 2005 Cummins ISM engines. Since
the baseline information on both groups was nearly identical, at .11%, or
roughly 1/9th of 1% apart, due to excellent record keeping by Scott Reedy
of Exel, we were able to tabulate the above the baseline based on 133,953
miles travelled.
Control Group Trucks - Phase 1
Tractor # Begin End Total Tot. Gallons Mpg
315903 93669 109529 15860 2895.15 5.478
315904 93386 108853 15467 2779.88 5.564
315906 86275 98723 12448 2344.22 5.310
315907 95272 108298 13026 2342.9 5.560
315910 92920 104087 11167 2050.7 5.445
67968 5.471
Phase 1: Control Group Fleet Mpg = 5.471 Mpg
Pre-Catalyst Group Trucks - Phase 1

11. 11
Tractor # Begin End Total Tot. Gallons Mpg
315911 109663 123844 14181 2529.24 5.607
315913 95125 108556 13431 2476.45 5.423
315914 99693 115062 15369 2809.38 5.471
315915 89735 101569 11834 2124.58 5.570
315926 79745 90915 11170 2101.99 5.314
65985 5.477
Phase 1: Pre-Catalyst Group Fleet Mpg = 5.477 Mpg
*Type IV Study - In this type of study, we see the following to determine
final savings. An increase in the Catalyst Group from the baseline of 5.474
Mpg to a final fleet reading of 5.790 Mpg, which indicates an increase of
5.77%. The Control Group moved from the baseline of 5.474 Mpg to a
final fleet reading of 5.539 Mpg, an increase of 1.18%.
5.77% - 1.18% = 4.59% (Final overall Lima savings in fuel costs).