[HowGudAmI]

Hi everyone - i own a 1983 Austin Mini Sprite with a 998cc A-Series engine, here is a quick bit of info:

Petrol is currently about 139.9p ($2.23) per litre around here.
Thats £6.37 ($10.18) per UK gallon
Or £5.30 ($8.48) per US gallon

My car has averaged 29.36 uk mpg (24.45 us mpg) (9.62 l per 100km) between 16th sep 2011 and 25 mar 2012 over 1733 miles. mostly town driving and country roads with the odd bit of fast dual carriage ways.

I made no effort to 'hypermile' over that time - i just collected the data out of interest, i have each fill up accounted individually.

I am now looking to hypermile as an experiment more than anything - i have read the various tips around the site but i am seeking some information more specific to my car (and its age).

here are my questions:

1. Is my car still using petrol in gear decelerating (foot off throttle)?

2. I have a vacuum gauge - i know the general consensus is to be in the highest gear possible when climbing a hill and scrub off some speed. what confuses me is - I have found that sometimes, my vacuum gauge reads higher (less poor) if i shift in to 3rd whilst climbing (car has 4 gears)...
Which is delivering better FE?

3. Has anyone any idea of the BSFC for my engine?

4. Any other advice that will help me improve my mileage (old car specific or not)

I am currently in my first tank of petrol where i have tried to be efficient (usually do 100 miles between fills - i have done 70 so far so i am close to getting some data). I have generally smoothed out my driving - done a little p+g and eoc.

Will post here when i find out what i get!