I've been searching around the forums trying to figure out why my gas milage is so horrible. I know my cats are probably clogged, but how much would that reduce gas milage by? I finally decided to measure, the last time i filled up, and i seem to be gettin around 19 L / 100 km, which is horrible. Its a stockport 12a, carbed. I know that I have a leak in the tank, which is why i keep the gas below half all the time, and I figured that some of it still is evaporating, but does that account for how much gas i seem to be losing?

 

can u convert that to MPG?

 

that would be like 5 gallons/62 miles. So its about 12.4 MPG

 

It's about 12.5 MPG. Pretty poor. My old 12a '79 would get about 16MPG with a heavy right foot in city traffic. Gas evaporates quite quickly, so my guess is that you're losing it there. I would also replace all tune-up parts if you haven't recently. If it's been a while, new plugs, wires, dist cap and filters will increase your engine's efficiency. I also wouldn't light a match around your car if I were you!

 

I wish i could tell what mine got. I never want to spend the money to fill the tank to get a accurate reading

 

19mpg, much better than i ever expected with the setup on my 83...something is definitly wrong if you milage is that bad

by the way, use mpg next time you silly canadian

 

i just took my 84 gs basically stock except all emissions removed and i have rigged the air canister to breath better and have a RB header and springs. i drove 360 miles after filling up my tank and still had a little less then a quater tank when i got to my destinstaion i think thats about 34 miles isnt it i was amazed. 4 grand and then some the whole way. it has a fresh tune up too.

 

Hmm...sorry bout the km/l thing mcnannay, i'll try to remember that, lol. As for the tune-up parts, they're all new except the dizzy cap, i could try that. But, from what it looks like, I guess it seems like i'm going to need to drop the tank.

How much louder will the car be with the stock exhaust, and the bricking in the cats broken out?

 

wow thats bad... im getting a bit over 10-11L/100Km

except for a larger exhaust its stock (god i wish i had more $$$)