| Description | Date | Identifier | |
| Improving fuel economy in comparison to heavier American cars, with tests proceeding. | 26th Nov 1936 | Box 147 \ 5 scan0115 | |
| Report comparing the petrol consumption of a Chevrolet and a 30 HP Rolls Royce. | 26th Nov 1936 | Box 147 \ 5 scan0116 | |
| Test report comparing the performance of a weighted Chevrolet against a 30 HP Rolls-Royce. | 26th Nov 1936 | Box 147 \ 5 scan0117 | |
| Petrol consumption tests and experiments on various vehicles to improve fuel economy. | 12th Jan 1937 | Box 147 \ 5 scan0118 | |
| Experiment comparing the fuel economy of a standard 25/30 HP engine with one modified with vacuum controlled ignition advance. | 12th Jan 1937 | Box 147 \ 5 scan0119 | |
| Performance graph for the 25/30 HP engine showing Economy and Ignition Advance at Part Throttle. | 9th Dec 1936 | Box 147 \ 5 scan0120 | |
| Petrol consumption test results for vehicle 37-EX, comparing a standard carburettor with a modified setup. | 5th Jan 1937 | Box 147 \ 5 scan0121 | |
| Petrol consumption test results comparing standard top gear and over-drive on the Phantom III. | 16th Feb 1937 | Box 147 \ 5 scan0122 | |
| Graph of MPH vs RPM for Standard Top and Overdrive gears, with an axle ratio of 8x34. | 11th Feb 1937 | Box 147 \ 5 scan0123 | |
| Consumption test comparing overdrive and normal top gear performance. | 25th Feb 1937 | Box 147 \ 5 scan0124 | |
| Consumption test results for a vehicle with and without overdrive. | 25th Feb 1937 | Box 147 \ 5 scan0125 | |
| Reports of significant improvements in petrol consumption in America due to new carburetter technology. | 31th May 1937 | Box 147 \ 5 scan0126 | |
| Fuel consumption, comparing their vehicles with American models and exploring factors like power-to-weight ratio and overdrive. | 31th May 1937 | Box 147 \ 5 scan0127 | |
| Petrol consumption test report for a Wraith 25.G.V1. comparing a standard carburettor with one using a separate idle feed. | 14th Jun 1937 | Box 147 \ 5 scan0128 | |
| Collaboration with Vauxhall on fuel economy studies. | 7th Jul 1937 | Box 147 \ 5 scan0129 | |
| Resume on fuel economy comparing experiences with Vauxhall Motors and outlining a 7-point development programme. | 8th Jul 1937 | Box 147 \ 5 scan0130 | |
| Carburettor servicing, fuel distribution problems, and related test methodologies. | 8th Jul 1937 | Box 147 \ 5 scan0131 | |
| Engine performance, covering valve timing, ignition systems, and combustion chamber design. | 8th Jul 1937 | Box 147 \ 5 scan0132 | |
| Power loss in the exhaust silencer, comparing Vauxhall and Rolls-Royce 25/30 engines. | 8th Jul 1937 | Box 147 \ 5 scan0133 | |
| Specifications and testing procedures for a carburetter, including details on test tackle from Vauxhall. | 8th Jul 1937 | Box 147 \ 5 scan0134 | |
| Procedures for testing vacuum pump settings, part and full throttle flows, and the use of a Crest Volt Meter for spark gap analysis. | 8th Jul 1937 | Box 147 \ 5 scan0135 | |
| Electrical and road test results on a Vauxhall engine. | 8th Jul 1937 | Box 147 \ 5 scan0136 | |
| Notes on engine component design, materials, and testing, including tappets, springs, and cold chambers. | 1st Jul 1937 | Box 147 \ 5 scan0137 | |
| Disappointing petrol consumption on car 32-EX, proposing tests, and arranging further vehicle testing in France. | 14th Jul 1937 | Box 147 \ 5 scan0138 | |
| Petrol consumption tests on a Phantom III vehicle. | 17th Jul 1937 | Box 147 \ 5 scan0139 | |
| Cost-effectiveness of a new ignition control design aimed at reducing fuel consumption. | 28th Jul 1937 | Box 147 \ 5 scan0140 | |
| Comparison of two ignition control schemes aimed at reducing fuel consumption and improving slow running. | 10th Aug 1937 | Box 147 \ 5 scan0141 | |
| The results of carburetter tests for improved petrol consumption and startability. | 17th Nov 1937 | Box 147 \ 5 scan0142 | |
| Consumption tests for the Phantom III carburetter, detailing alterations and test results. | 16th Nov 1937 | Box 147 \ 5 scan0143 | |
| Test report comparing fuel consumption improvements with different carburettor jets and overdrive settings. | 16th Nov 1937 | Box 147 \ 5 scan0144 | |
| Report comparing petrol consumption figures for the Phantom III model with different carburetter and overdrive settings. | 17th Nov 1937 | Box 147 \ 5 scan0145 | |
| Outlining suggested experiments for Wraith III petrol consumption tests. | 17th Feb 1938 | Box 147 \ 5 scan0146 | |
| Petrol consumption tests for the Wraith 29.G.VI model. | 19th Feb 1938 | Box 147 \ 5 scan0147 | |
| Outlining the conclusions from a discussion on improving the fuel economy of the Wraith model. | 28th Feb 1938 | Box 147 \ 5 scan0148 | |
| Project plan detailing road and test bed evaluations for a carburetter on the Wraith model. | 28th Feb 1938 | Box 147 \ 5 scan0149 | |
| Fuel consumption tests and the value of suction ignition advance on the Wraith and 25/30 models. | 31th May 1938 | Box 147 \ 5 scan0150 | |
| Fuel consumption tests for the Wraith model, detailing performance issues and comparisons with the 30 HP model. | 31th May 1938 | Box 147 \ 5 scan0151 | |
| Carburettor jet settings and their effect on fuel consumption. | 31th May 1938 | Box 147 \ 5 scan0152 | |
| Graph comparing constant speed petrol consumption for different car chassis and carburettor settings. | 24th May 1938 | Box 147 \ 5 scan0153 | |
| Alterations to the induction system and carburetors to improve fuel economy. | 29th Oct 1938 | Box 147 \ 5 scan0154 | |
| Bentley III petrol consumption tests and comparisons. | 29th Oct 1938 | Box 147 \ 5 scan0155 | |
| Results of fuel consumption runs and average speed tests. | 29th Oct 1938 | Box 147 \ 5 scan0156 | |
| Constant speed consumption tests for Bentley III carburetors using a Zenith Mileage Tester. | 29th Oct 1938 | Box 147 \ 5 scan0157 | |
| Cold starting issues with a 'Startex' carburetter at 6°F. | 29th Oct 1938 | Box 147 \ 5 scan0158 | |
| Graph of constant speed petrol consumption (MPG vs MPH) for a 7 B.V. engine, comparing different needle types and gear settings. | 29th Jun 1939 | Box 147 \ 5 scan0159 | |
| Requesting the standardisation of vacuum-controlled distributors on a cast iron engine to improve fuel consumption. | 29th Jun 1939 | Box 147 \ 5 scan0160 | |
| Accompanying a report comparing fuel consumption of their cars against American practice. | 13th Mar 1940 | Box 147 \ 5 scan0161 | |
| Note on the Olley report of February 1940, comparing fuel consumption curves and overdrive economy for various cars. | 14th May 1940 | Box 147 \ 5 scan0162 | |
| Estimation of the fuel economy benefits of streamlining on the Corniche model. | 14th Mar 1940 | Box 147 \ 5 scan0163 | |
| Graph comparing the Constant Speed Ton Miles Per Gallon for various cars against Miles Per Hour. | 14th Mar 1940 | Box 147 \ 5 scan0164 | |
| Graph comparing the constant speed Miles Per Gallon (M.P.G.) for various car models. | 18th Mar 1940 | Box 147 \ 5 scan0165 | |
| Request to run a constant speed test to compare oil consumption between S.A.E. 20 oil and Castrol XXL. | 18th Mar 1940 | Box 147 \ 5 scan0166 | |
| Petrol consumption figures for various vehicle models tested in France and England. | 24th Sep 1940 | Box 147 \ 5 scan0167 | |
| Comparison table of fuel consumption (MPG) data from tests in France and England. | 24th Sep 1940 | Box 147 \ 5 scan0168 | |
| Petrol consumption figures for various car models. | 24th Sep 1940 | Box 147 \ 5 scan0169 | |
| Petrol and oil consumptions for various experimental vehicles. | 30th Sep 1940 | Box 147 \ 5 scan0170 | |
| Fuel and oil consumption report for a Commer vehicle over a distance of 2487 miles. | 30th Sep 1940 | Box 147 \ 5 scan0171 | |
| Petrol consumption test results for a Vauxhall '10' car. | 20th Oct 1940 | Box 147 \ 5 scan0172 | |
| The petrol consumption of Morris, Standard, and Vauxhall vehicles and the need to check their speedometers for accuracy. | 12th Nov 1940 | Box 147 \ 5 scan0173 | |
| List of petrol and oil consumption figures for experimental cars and lorries. | 1st Dec 1940 | Box 147 \ 5 scan0174 | |
| Comparative list of fuel consumption figures for various vehicles with different carburettor types. | 3rd Dec 1940 | Box 147 \ 5 scan0175 | |
| Historical inaccuracy of the 5th wheel speedometer and subsequent recalibration efforts. | 1st Jan 1941 | Box 147 \ 5 scan0176 | |
| Wheel and speedometer calibration, detailing error calculations and recommendations for future testing. | 1st Jan 1941 | Box 147 \ 5 scan0177 | |
| Requesting the handover and maintenance of charts for cylinder bore wear, oil, and petrol consumption. | 24th Mar 1941 | Box 147 \ 5 scan0178 | |
| Petrol consumption comparison between two different chassis configurations. | 1st Apr 1941 | Box 147 \ 5 scan0179 | |
| Petrol rationing applications, allowances, and cancellations for three individuals. | 8th Apr 1941 | Box 147 \ 5 scan0180 | |
| Short memo from Rm to Bly regarding petrol consumption figures. | 1st Jul 1941 | Box 147 \ 5 scan0181 | |
| Table comparing constant speed petrol consumption for various vehicle models. | 27th Jun 1941 | Box 147 \ 5 scan0182 | |
| Letter from Rotol Airscrews Ltd. requesting petrol consumption figures lost in the blitz for the Secretary of Mines Department. | 27th Jun 1941 | Box 147 \ 5 scan0183 | |
| Performance and consumption test report focusing on 1-RT-1 carburation. | 4th Sep 1941 | Box 147 \ 5 scan0184 | |
| Notes on carburetter settings, discussing performance, economy, and cold weather issues. | 4th Sep 1941 | Box 147 \ 5 scan0185 | |
| Carburetter settings for cold weather, detailed carburetter specifications, and an investigation into the engine running on after being switched off. | 4th Sep 1941 | Box 147 \ 5 scan0186 | |
| Engine trouble, specifically backfiring after shut-off causing difficult hot starts. | 4th Sep 1941 | Box 147 \ 5 scan0187 | |
| Performance test report showing an acceleration curve, fuel consumption, and vehicle specifications. | 30th Sep 1941 | Box 147 \ 5 scan0188 | |
| Performance review of a motor car, noting good petrol consumption but issues with fan noise and a groaning servo. | 30th Sep 1941 | Box 147 \ 5 scan0189 | |
| Notes on the relative merits and fuel consumption of fixed choke and expanding carburettors. | 4th Sep 1941 | Box 147 \ 5 scan0190 | |
| Comparative analysis of Stromberg and S.U. carburettors, focusing on fuel consumption and features. | 4th Sep 1941 | Box 147 \ 5 scan0191 | |
| Comparison of SU and Stromberg carburettor characteristics, discussing performance, simplicity, and tuning. | 4th Sep 1941 | Box 147 \ 5 scan0192 | |
| Comparison of SU and Stromberg carburettors, discussing idling performance and adaptability to automatic chokes. | 20th Oct 1941 | Box 147 \ 5 scan0193 | |
| Issues with hot-spotting and carburettors, outlining three potential future design choices. | 20th Oct 1941 | Box 147 \ 5 scan0194 | |
| Letter responding negatively to an inquiry about improving petrol consumption on a 25/30 HP car. | 2nd May 1942 | Box 147 \ 5 scan0195 | |
| Letter of complaint regarding high fuel consumption of a 'Rolls' car, chassis number GTL.79. | 4th May 1942 | Box 147 \ 5 scan0196 | |
| Record of pool petrol used by private and transport vehicles for the week ending 22nd January 1944. | 24th Jan 1944 | Box 147 \ 5 scan0197 | |
| Monthly oil and petrol consumption figures for various vehicles for December 1943. | 27th Jan 1944 | Box 147 \ 5 scan0198 | |
| Record of Pool petrol usage by private and transport vehicles for the week ending 29th January, 1944. | 30th Jan 1944 | Box 147 \ 5 scan0199 | |
| Record of Pool petrol usage for private cars and transport vehicles for the week ending 5th February 1944. | 7th Feb 1944 | Box 147 \ 5 scan0200 | |
| Record of Pool petrol used by private cars and transport vehicles for the week ending 12th February 1944. | 15th Feb 1944 | Box 147 \ 5 scan0201 | |
| Record of Pool petrol used by private and transport vehicles for the week ending 19th February, 1944. | 21th Feb 1944 | Box 147 \ 5 scan0202 | |
| Record of pool petrol used by private and transport vehicles for the week ending 4th March, 1944. | 6th Mar 1944 | Box 147 \ 5 scan0203 | |
| Record of Pool petrol used by private and transport vehicles at the Clan Foundry, Belper, for the week ending 11th March 1944. | 13th Mar 1944 | Box 147 \ 5 scan0204 | |
| Record of Pool petrol usage for private and transport vehicles for the week ending 18th March 1944. | 18th Mar 1944 | Box 147 \ 5 scan0205 | |
| Record of Pool petrol used by private and transport vehicles for the week ending 25th March, 1944. | 27th Mar 1944 | Box 147 \ 5 scan0206 | |
| Bensport accelerator pedal, comparing it to one made for Peregrine. | 10th Sep 1932 | Box 147 \ 5 scan0207 | |
| Sending drawing N.sch.3617 for modified clutch and brake pedals to suit the J.1. engine. | 8th Dec 1932 | Box 147 \ 5 scan0208 | |
| Improvements to the 'Bensport Pedals' arrangement on the No.2 car for driver comfort. | 24th Apr 1933 | Box 147 \ 5 scan0209 | |
| Noise complaint regarding Bensport Pedals and the proposed solution. | 8th May 1933 | Box 147 \ 5 scan0210 | |
| Spherically mounted Bensport Pedal Shaft designed to overcome excessive wear. | 19th May 1933 | Box 147 \ 5 scan0211 | |
| Accessibility issues with the Bensport accelerator pedal and a proposed modification. | 19th May 1933 | Box 147 \ 5 scan0212 | |
| Redesign of the Bensport Brake Pedal Stop, stiffening it and reducing material gauge. | 19th May 1933 | Box 147 \ 5 scan0213 | |
| Fitment of a Bentley spherical pedal shaft to a 10,000 miles test car. | 12th Sep 1933 | Box 147 \ 5 scan0214 | |
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