Evening star. [volume] (Washington, D.C.) 1854-1972, 1935-08-18

a demand for gasolines giving the
utmost in power and performance.
Usually they are higher in 'octane
number the measure of knock re-
sistance. They are used chiefly in
h-compreSsion motors and in mo-
tors in which carbon accumulations
have reduced the size of the COM
bustion chamber, thus increasing the
compression and causing a greater
tendency to knock. Premium fuels
also are used to obtain easier starting
and more rapid acceleration. Cen
orally, they contain tetraethyi lead.
knock-suppressing element, or are
blended with benzol, which gives the
same effect.
Regular grades of motor fuel have
been improved in anti-knock qualities
and increased in volatility in recent
years to assure satisfactory perform
ance in the average motor vehicle.
Many of them contain tetraethyl lead
but in smaller quantities than in the
premium fuels.
"Third-grade motor fuels are mar
keted to satisfy the demands of con-
sumers who seek economy rather than
performance. Less volatile and lower
in knock resistance, they are salts
factory for many cars"
The tremendous volume OF traffic
being carried by main highways in
these days of heavy tourist movement
indicates that motorists are making
too little use Of maps in planning
their Summer travels, in the opinion
of officials of the Keystone Automo-
bile Club.
1t is not to be denied that there
has been vast improvement in sign
marking the Nations highways in re-
cent years, the club points out; this
circumstance, it is stated, should not
lead the tourist into the belief that
maps no longer are necessary.
They very definitely can be studied
to the great advantage of any one
planning a Summer vacation voyage"
says keystone bulletin just issued.
The student of maps learns very
quickly that the highway network has
been SO improved and expanded that
several routes are likely to be avail
able to him, especially in the more
populous parts of the country.
Each offers its particular ad-
vantages. In the case of one, it may
be shortening of the distance in
volved with a resultant saving in
gasoline and oil consumed, and in
time spent in actual travel. A second
highway may appeal from the stand
point of scenic advantages, while
third may offer relative freedom from
traffic congestion and its attendant
delays and dangers.
"Oftentimes there is no distinc-
ton between alternate routes in those
primary NEUTRALITY-SUSPICIOUS.,
stralghtneSS and width. What may
appear to be secondary road may
be just as fast, or faster, and as
safe as the main trunk line.
THE wide field of choice in high
ways, however, is not likely to be real
lied unless use is made of the large
number Of inexpensive maps avail
able. That this is not being done is
indicated by the distribution of tour
ist traffic on the various routes.
ut is natural, of course, that the
main line should carry the bulk of
the Summer tourist tide. 1t is not
quite reasonable, however, that it
should carry so large percentage
Of it as is indicated in todays per-
Torrance. A more studious use of
maps, it would seem, would result in
a considerably better situation all
around"
Eleven points Of safety are specified
on caution card which the American
Automobile Association is distributing