Never had a '64 225 slant six, did you (37 mpg)?
Or a '79 318 D-150 (21-23 mpg)
Or a 68 Road Runner (17 around town and 23 highway)
I've never had a Mopar that got bad mileage unless it was from a need for
repair or a lead foot.
"Our Constitution was made only for a moral and religious people.
My '76 318 Ramcharger, when I got it new, could not get as much as
8MPG, Canadian. After fighting with the dealer for a month or two, I
redid the carb myself, adjusting the power needle and all that stuff -
got it up to over 23 on the highway, about 14 in town, and it just
sipped gas plowing snow.
The 264 or whatever in my Fargo truck would do over 27 on the highway,
and the 241 Hemi Coronet topped 30 on occaision.My slant sixes
generally did between 17 and 21, but I never babied those. The
accelerator pedal was operated like a switch.
On my D-150, being a 79, it lost the smog stuff, got a 1972 360 degree
two-barrel intake / carb and the vacuum curve was carefully set for full in
at minimum vacuum without causing ping.
The /6 had a mechanical advance recurve with 93 octane fuel and all the
advance it could handle.
The Road Runner got it's best mileage whenever anyone but me drove it ( my
mom , especially), but then, I was but 21 years old at the time and gas was
35 cents / gal. US.
Runner had wide ratio 4 speed and the long gears? Friend still has his
all original '69 runner with that equipment. Driven RIGHT, it would do
high 20s on the highway. Push it a bit, and you could easily get 10.
EASILY bury the needle in third.
383, 727, 3.23 axle. Lowered 1" in front, belted F70-14 tires, the original
type of Wynn's Friction Proofing in the engine, Sunoco 260 and all the
advanc it could handle. Best quarter-mile 13.65 / 105 in second.
<LOL> I saw 6300 rpm a couple times in mine. I usually shfted at 5800 during
a run so the shift would be complete at 6000. Second was good for 120 and
high would bring the counterbalance end of the speedo needle to 30. Man!!!
what a ride!!!!
THese are not reality. The only maybe here is the 79 P/U, the rest
are way out they in left field. I remember road runners were new and
the MPG was about half than amount and I owned a few slant sixs that
strain to make low 20's a few times and a 170 valent that did 23 once
but 37 MPG with a 225 is pure bull.
Yes, they are. My personal values and religious beliefs forbid lying.
No, they aren't. Btw, with a bed cover, the truck hit an alltime best of 25
mpg between Laramie WY and Moab, UT . . .yep, in the Rocky Mountains.
And how old were you and how far in the carbs did you stick your foot? My
mother and sister got the high mileage, I got 11-14, except of Friday nights
whern I got 4-5 mpg for each 1/4 mile.
No, it isn't. Chrysler got 27 mpg out of a bone stock slant in 63 in the
Mobilgas Economy run on BIAS PLY TIRES. Mine had a few special mods and
adjustments: tight valve lash (0.008" IN / 0.010" EX), water vapor
injection, maximum intial advance, 93 octane fuel, steel beltradial tires @
35 psi, lowered 1 1/2" in front, 3-speed manual trans with a 3.23 axle and
294,000 miles on it.
Just because it didn't happen to you does not mean it cannot happen to
someone willing to do what it takes: experiment and test.
Sounds like my '63 170 V200 Custom 4 door. Lowered about 2" all
around, Hemi Cuda shocks, C70-13 polyglass tires, head shaved 20 thou,
intakes at .005, exhaust at .010 (adjusted religously), dist recurved
to roughly mimic the curve on the 273HO, 225 carb rejetted, and
running NippondensoEPR25, IIRC plugs. The only other plugs I could
keep in it were Champion N3G fine-wires. Mine had the 3 speed push
button slush-box but put 206 HP to the rear wheels on Sunoco 260. If
driven hard (the way I usually did) it drank fuel at the rate of
something like 12-14 MPG Canadian. Driven reasonably mabee twenty, and
the odd time I got it on the highway for a good run (like down to
Letchworth NewYork with some friends to keep me sane) mid to high
twenties. I may have squeezed 30 out of it once or twice. Keep in
mind, this is the big Canadian Gallon - and an automatic.
My '69 Dart custom 225 was considerably milder, and a mid-winter trip
to Alberta averaged in the high 20s, including the 104mph dash across
the corner of Wyoming. Car only got shut off once for more than an
hour on the whole trip (3 drivers). Overall mileage was mabee 22
average when around home - with 75000 or so miles on it when I got it
and closer to 225,000 when I sold it.
The Imperial gallon is 20% larger than a US gallon so your twenty mpg Imp.
becomes 24 mpg US.
Ya should gone the whole route on the head 0.090", then your CR would have
gone up a full point ( 9.4:1) and no valve interference with a stock lift
cam. I had a 65 engine with the head milled the full amount and it ran great
on 260. I used Champion N-10Y plugs with no problems.
That figures to 26.4 US mpg.
I made a weekend trip once in my RoadRunner from Indianapolis IN to Nauvoo
IL. Five adults, weekend luggage, 552 miles, 6.7 hours, 13.42 mpg. ( what'll
really make the younger folks mad...gas costs for the trip west, $13.95 US)
Most of the time, between towns, I cruised at 115-120 mph. Not bad mileage
considering I had the secondaries (Carter AVS) open most of the time.
Sorry Budd, but you got your math backwards. If the imperial gallon is
LARGER as you say, then the mileage goes DOWN when converted to US, not up
as he had 20% more fuel to obtain his mileage. Take away 20% of the fuel
and you take away 20% of the mileager so he was getting 16 mpg US which is
about right for that engine under "normal" driving.
No it doesn't! If he could get the same distance with his fuel usage in the
same number of US gallons then he would have to be getting 26.4 mpg but that
is not what happened. He was using imperial gallons (at least for most of
Me thinks the BS is getting a bit deep.
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