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Thread
started on 16/4/2007 12:03
Two things following Saturday’s meeting: Car calculation and Good energywritten on 16/4/2007 20:22
Thanks, Bill. I know my mpg intimately! I spend more time looking at the average indicator on the dashboard than the road and I check every fill-up. The last one worked out at 12.5 miles to the litre over 428 miles = 57mpg. Not bad! Normally usage between Littondale and Bradford and roundabout works out at 53/54mpg, diesel. Good Energy told me that normally their costs are 10% higher than conventional suppliers, but those on Economy 7, like us, are harder hit. Richard Electrictywritten on 21/4/2007 13:39
I will move over sometime soon, but when I first looked my problem was that I do not use a lot of electricity. Tariffs that charge me by the KwH, even at the higher rate for low usage, work out cheaper that tariffs that charge me a quarterly standing charge and then a extra amount per Kwh. My usage in the summer quarters was so low that the quarterly standing charge pushed up the effective price per KWh in those quarters to a very high level. I will redo the sums as prices everywhere have risen a lot and let you know. DVLA reminder also may helpwritten on 20/4/2007 19:32
Forgive me, good Leeds CRAGgers, if posting this comment is an abuse of my site admin rights but I thought you might be interested in this long forum thread on car emissions: http://www.carbonrationing.org.uk/fora/threads/recording-car-emissions-c… best wishes Andy PS. Congratulations on getting your CRAG up and running! Car emissionswritten on 23/4/2007 08:52
Andy, thanks Yes, I need to amend the instructions on our online calculator where we say that the official car fuel data figures are the “best” way to calculate car emissions. Maybe it should read “possibly the most convenient, but…” Simplicity vs accuracy seems to be a recurring theme. ————————————————— car fuel datawritten on 29/1/2008 09:26
CO2 data is only available for new-ish cars because it wasn’t required before. The government’s online calculator Act On CO2 multiplies the manufacturer’s co2 figure by 115/100 to give “real” emissions since the manufacturers use “ideal” figures. For cars before this time you can derive co2 from mileage (careful – you need overall average mileage, not “urban” and not “distance”). Then you need a conversion factor for efficiency and the best I’ve found are those used by Act On co2 again: (couldn’t get columns so had to do it like this! – first figure refers to engine size in litres and second is conversion factor in gCO2/km) Petrol smaller than 1.4, 0.183, ptrl 1.4-2.0, 0.216, ptrl larger than 2.0, 0.296 overall ave petrol – 0.210 NB these don’t need to be multiplied by 115/100 because they are derived from real driving conditions. Of course, they’re very broad averages, but they are good qulaity broad averages. Hope this helps. Matt |
Richard! Nigel suggested
Bill Phelps
Richard!
Nigel suggested Parker’s who list a wider range of cars (not just the latest models). They don’t give you a gCO2/km figure, but list MPG instead.
I’ve started amending the web calculator and hope to have the new, improved version running sometime this week.
I’m horrified to hear how much extra Good Energy would charge you. This needs looking into.
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Bill Phelps :: Stop Climate Chaos (Leeds)