Mileage from a tank of fuel?

I'm trying to gauge if my cabby is over fueling or if the mpg is just horrific  8O

What sort of mileage should I be expecting from a full tank of fuel?

I know it depends on driving style etc but a rough idea would be good!

The car's a 1.6 carb.

320 miles .

I got about 200 miles on just over half a tank on the m/way (1.8 on a knackered pierburg), so I reckon chudd's probs right around 320 maybe 350..

350 to 360 on my 1.8 Web'rd 89 Clipper. Standard mixed driving.

Wow ok, I struggled to get 250 miles from a full tank at the weekend and that was with driving like a granny!  8O

Is there anything I check to see if it's over-fuelling?
Spark plugs?

The exhaust doesn't seem black and i'm not aware of any smoke coming from the exhaust at idle or on the move.

Should add, I've checked for leaks too but all the pipework seems to be fine so I don't think it's losing fuel anywhere.  :dontknow:

All depends on your driving style and where you're driving. I'm in London so I'm on and off the gas and stamping on the anchors all the time. I mange to get around 260 miles out of a tank with a 1.8 GTi.

Tian

You really need to do a proper check by filling it up, running it hundreds of miles and then refilling to top and working out exactly what its doing. All this 10 quid gets me x miles or I have to fill it up after y miles will only give you a rough estimate. A couple of mm on the guage is prob 1 gallon either way.

From experince carb'd MK1s give 25-40mpg+ with average @35 ish on a decent run, GTI 1.8 again 30-40 with high 30s on a run and diesel Caddy would do 45-55mpg depending on load and type of journey.

My 1.5 does about 250 miles on a kinda urban run…

Which way do you turn the mixture screw to make it more lean?

I wouldn't think it that wise just to go playing with your mixture screw just because you think your fuel economy is bad!

Could be down to lots of factors - tyre pressure, brakes binding slightly etc?

tyeness said

I wouldn't think it that wise just to go playing with your mixture screw just because you think your fuel economy is bad!

Could be down to lots of factors - tyre pressure, brakes binding slightly etc?

Well I suspect its running rich due to the carbon deposits in the exhast, although that could be from when it was running cold cos the thermostat was  opening too early…

Someone told me at the Berkshire meet that turning it one way until it starts hunting, turn it the other way until it stars hunting, count number of turns, then turn it back half way until peak RPM then lean it off abit  :dontknow:

Too lean means running too hot and too rich means downed MPG hence why I aint touched it… maybe look at the spark plugs?

Too lean means running too hot and too rich means downed MPG hence why I aint touched it… maybe look at the spark plugs?

Definitely check the plugs I reckon

That method you described sounds decent enough, though not the sort of thing I like to attempt personally (I usually make a mess of stuff given half the chance! ). Do you have a friendly garage that could look at it? Then they could check your emissions to see how much unspent fuel actually ends up the exhaust.

In my 1.5 I get about 240ish but always fill it up when it gets to the red which is about 220 miles. the most I ever got out of it was with mainly motor way miles 260.

I get less out of it if I drive with the roof down a lot.

myns a 1.8 carb with the normal pierberg carb as well.

filled up then completed 330 miles (1/3 with the roof down) 80% m/Way fast A road.

and then filled up again took 39.15 litres

so I work that out at around 38 miles per gallon.
So given speedo always over ambitious, around 35 per gallon.