Thread: Gas Mileage

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SEE.....gearheads will find a way.
I like the speed reduction gimmic the best. I don't give a damn if I get honked at or if 18 wheelers tailgate me.
It's a big savings to go 60 vs 70+
Further, I make sure I'm at the proper tire inflation figure.
Still, all that won't help when gas continues to climb.
I'm betting on 15 bucks per gallon before the end of the decade and I'm preparing for it NOW!!
DT

Dave
A cold air intake might give you negative mpg gains but will help the hp.
I'm sure you know that air/fuel ratios fall into a narrow band and that a given displacement engine under load will require a set amount of fuel to maintain stoichimetric levels. Cylinder volume dictates the amount. So, a cold air intake will result in a denser charge in the cylinder and that will require more fuel. To maintain speed a set rpm is required. The increase in power will let you use a lesser throttle setting so you are still supplying the same amount of air/fuel in a denser charge as you would without the cold air. Thus no appreciable loss or gain.
The only way to improve milage is to lessen displacement, lessen load and have a fuel management system that will run the engine at the leanest possible a/f ratio for load conditions.
gonna dance, gotta pay the piper an a whole bunch of middlemen.

The engine in the Chrysler is the 2.7 and I rarely run the speed limit. Half the trip is in Missouri where the speed limit is 70 for the most part and I had the cruise set on 75. The route I took in Kansas the speed limit varies from 55 to 65 and I had the cruise set to 5 mph over. The gas is 87 octane with up to 10% ethanol and I used 17.4 gallons round trip. Take out the ethanol and it would have been higher.

Originally Posted by 61bone

Dave
A cold air intake might give you negative mpg gains but will help the hp.
I'm sure you know that air/fuel ratios fall into a narrow band and that a given displacement engine under load will require a set amount of fuel to maintain stoichimetric levels. Cylinder volume dictates the amount. So, a cold air intake will result in a denser charge in the cylinder and that will require more fuel. To maintain speed a set rpm is required. The increase in power will let you use a lesser throttle setting so you are still supplying the same amount of air/fuel in a denser charge as you would without the cold air. Thus no appreciable loss or gain.
The only way to improve milage is to lessen displacement, lessen load and have a fuel management system that will run the engine at the leanest possible a/f ratio for load conditions.
gonna dance, gotta pay the piper an a whole bunch of middlemen.

Ok, thanks Bone. My thinking was that less restrictive would help.... Guess I know more about going fast then mpg..... Oh well, my 'round to it' list is plenty long anyhow!!!!!!

Its not the honking I mind. I have a picture here somewhere I'll have to post.
In about 72, I drove a honda car (first I'd ever seen) that got 75 mpg. As I remember, it had a 350cc engine. Knees were in my armpits and i could only get one foot in the pedal area at a time. Top speed was 45 on the flat.

My neighbor's brother had one... a Civic. He screwed up the motor and the Honda dealer wanted to have sex with him for the parts (or something similar). He had never worked on cars before so we had him unbolt the engine/trans assy and three of us lifted the front bumper and raised the car off of the engine cradle.

The engine looked familiar...it was a honda motorsickle engine...he went to the Honda bike shop and the parts were about half the price as was at the Honda car dealer. Dont remember his mileage but I do remember it was a dog....never rode in it since I dont ride in Jap crap cars as a personal pledge.