Does anyone know how to improve the gas mileage on a 170 slant? Thx

What model and year is your car? How many miles on it? Manual or automatic transmission? Rear axle ratio? What kind of driving do you do, mostly city or mostly highway? What gas mileage are you getting now?

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Not trying to be sarcastic but drive 50-55 like I do.

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82 D150-225/727
02 Dakota-3.9/5 speed
87 GMC C7000-8.2 Detroit Diesel/5+2

The basics:
Go easy on the gas pedal, and on the brakes. Less acceleration.
Lighten up! Clean out the trunk, the back seat, etc.
Tuneup. No, a real tuneup. Use a tach, timing light, vacuum gauge, and all. Carb, choke, valves, distributor, spark plugs and wires.
Keep your tires inflated properly.
Check your brake adjustments.
Get a fresh alignment.

Then you start getting fancier.
Synthetic oil.
Electronic ignition.
Two-barrel carburetor.
Low restriction exhaust.

Go Crazy!
Crank scraper / windage tray.
Headers.
EFI.
Aerodynamic aids.
Fiberglass/Carbon Fiber body panels.

Notice that most of the changes to the car can also improve its performance.

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"When you find a big kettle of crazy, it's best not to stir it." - Pointy-haired Boss

1964 Valiant V200, 225/Pushbutton 904
BBD, CAI, HEI, LBP, AC, AM/FM/USB, EIEIO

Duct tape a raw egg to your gas pedal. Then DONT BREAK THE EGG!!!

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'64 Dart GT convertible, 64 Dart 170 2-door post sedan in faded blue and rust (the Az Dart) & a sixty THREE Dart 170 2-door post sedan in faded blue and rust. (future project)
Early Dart Disorder (EDD) is real, and I've got it!

I'd need to have a hard-boiled egg...............

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

geez.... I wouldn't like to be your insurance company....

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

hard boiled? how about petrified?....

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If ya haven't been there, you just wouldn't understand.....
My friends and I spent a LOT of money in the eighties to get me this way!!!!

All excellent advice.
And you start having to do the maths to see how long it'll take the improved mileage to pay back your investment.
Well...sure, but I might quibble with that 2bbl carburetor. They make a nice driveability improvement, but mileage can go up or down, depending on a lot of different factors. It's possible to get much better mileage with a 1bbl than with a 2bbl.
Really only worth messing with if the engine's being opened for another, more pressing reason.
Not for a mileage improvement! Dutra Duals, yes. Headers, generally no.
Mileage payback time measured in decades
...such as a different car body...
Not something I'd trust my safety to in a street-driven car.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

I used synthetic oil in the tranny/rearend of a 74 dart, and had to hold the brakes on at traffic lights, so I think it would help a bit, and I don´t change that so often either...

Having to hold the brakes on at traffic lights is normal regardless of engine oil, with an automatic transmission.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

I think the super slippery synthetic oil slipped out and got on the brake shoes, making super slippery shoes....................

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

hehee the holding the brake at the stop light is killer! that would not only save you some mpg but some tickets too.... imagine this: you switch to synt and then you get a ticket for invading the pedestrian crossing lane....

sorry, I couldn't help

slant slant

mopar 225

dodge chrysler

(sorry, I suffer from Slanturrettes)

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

Assuming your doing it for purely economic reasons, true. Range is also a consideration, as is just having made a measurable improvement in one's car. And, remember, some of these items in the fancier group can be done very inexpensively, depending on your situation.
True only in that headers are generally made for increased power, with compromises made for convenience. The right set of headers or manifold, exhaust pipes, and muffler can improve fuel efficiency. Finding or making the right system for fuel economy isn't easy, and few bother. Again, this is "getting fancier"
Hence the "Go Crazy!" subheading.[/quote]

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"When you find a big kettle of crazy, it's best not to stir it." - Pointy-haired Boss

1964 Valiant V200, 225/Pushbutton 904
BBD, CAI, HEI, LBP, AC, AM/FM/USB, EIEIO

Ok, it was a manual 3 speed ok, and if the ground was about flat, I didn´t have to hold the brakes on before I changed to synthetic oil...IN THE TRANNY AND REAREND, the engine got old dinos in it...

Soooo, I guess it makes for less friction, and a bit of mileage