National Motor-Gasoline Survey: Winter 1947-48 Page: 2
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R. I. 4354
rating of 80.2, compared with 80.1 for the winter of 1946-47, and with 81.7
and 74.2 for the two winters preceding, respectively.
The volatility characteristics have changed also, but only slightly
since the war. Reid vapor pressure for premium-price gasolines was 10.2
pounds for the past winter, compared with 10.1, 10.0, and 9.0 for the three
previous winters, while regular-price gasolines had average vapor pressures
of 10.1, 10.1, 9.8, and 9.2, respectively. Compilations of distillation
data show that average temperatures of 1240 F. for the premium- and 1260 F.
for the regular-price gasolines at the 10-percent-evaporated points have
made virtually no changes in the three winters following VJ day, but are
about 80 lower than the figures for the winter of 1944-45. At the 50-percent-
evaporated points the two grades of motor fuel have distillation temperatures
of 2180 and 2290 F., which are very much the same as those of the two winters
preceding but are about 20 and 150 lower, respectively, than the 50-percent
temperatures of gasolines sold during the winter of 1944-45. The distilla-
tion temperatures at the 90-percent-evaporated points also showed little
change from the two preceding winters but at 3270 and 3350 F., are 21 and 130
lower, respectively, than those of 1944-45.
These figures reflect the abrupt changes from wartime gasoline quality
and the trend in postwar motor fuels. On the following page are shown the
average values, and a set of charts illustrates the comparisons.
In addition to these data, compilations of tests on six other properties
were made. The national average values are: Gravity, 62.4 oA.P.I. for
premium-price and 62.1 OA.P.I. for regular-price gasolines. Corrosion, nega-
tive for all samples tested. Sulfur content, 0.073 percent for premium and
0.091 for regular-price motor fuels. Gum-test results, 2.2 mg. per 100 ml.
for premium-and 1.9 mg. per 100 ml. for regular-grade gasolines. Tetraethyl-
lead contents, 1.85 ml. per gal. and 1.33 ml. per gal. for the two grades,
respectively.
The present report presents analytical data for 3,554 samples, repre-
senting the products of approximately 140 companies. The samples represented
in this report were obtained during December 1947 and January and February
1948. As in previous surveys, the gasolines covered by this survey include
those from both large and small suppliers. The data cover two groups of sam-
ples - regular-price and premium-price gasolines.
The number of samples, items, and brands comprising each group is as
follows: Regular-price, 1,885 samples, 315 items, and 133 brands; premium-
price, 1,669 samples, 279 items, and 131 brands. The meanings of these terms
as used in the surveys are as follows:
Sample: The individual supply of gasoline obtained at the filling
station and analyzed in the laboratory.
Brand: The gasoline sold in a given price group under a given trade
name. The figure representing the total number of brands sometimes
is only approximate, because in some cases the name of the marketer
is not reported.2521
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Blade, O. C. National Motor-Gasoline Survey: Winter 1947-48, report, July 1948; [Washington D.C.]. (https://digital.library.unt.edu/ark:/67531/metadc38499/m1/4/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.