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# Help - too old for this - math question

can someone work this out for me please
80 litres of LPG which equals 17.5 gallons

OK

so my car just did 360 miles on a full tank - as above 80 litres
how many miles does it do to the gallon

Help please cant seem to work out how many more miles my car now does to the gallon since I had it converted to LPG
It used to do 22 on ordinary petrol

pretty sure its 20mpg, but im prob wrong.

20.5...

80 litres is 17.6 gallons

So 360/17.6=20.45

MPG = Miles/Gallons = 360/17.5 = 20.57 MPG

360/17.5

20.571428571428571428571428571429 mpg

20.57142857142857142857142857149 mpg

£1.76 thank me later

You do less

Original Poster

ok I get it now its doing 20.5 to the gallon but costing half as LPG only cost 49p per litre so I am gaining
and can think that I cam doing mkore like 40 to the gallon of what I used to pay
was a bit worried there

Original Poster

boydent999;5920454

This is a good site for mpg calculation

wow - thanks for that:thumbsup:

It won't do any more MPG but you will save over time as the LPG costs less:thumbsup:

ok next question.............how much was the conversion and how many miles will you have to do before it pays for itself

Original Poster

got it - its doing 2 miles less per gallon but costing me half

Original Poster

conversion was £1,000 but I love my car I was going to change it as it was so expensive to run - its a Honda Shuttle 7 Seater and in amazing condition with low mileage - not an import, so I will be happy for the next 10 years with it and although it cost £1,000 it fels like it was worth the investment as I dont feel so bad driving it now it costs less

If you're looking at keeping the car long term, it'll definitely be worth the £1000 investment if you drive your car a lot, as it's just around half the cost if you're doing slightly less per gallon but costing less than half the price.

This effectively means that once you've filled your tank a little over 50 times, you'll start making a saving and the conversion has effectively paid for itself. :thumbsup:

20 mpg!!! what car do u drive, my dads megane is a diesel but it does 60mpg

£1000 = 440 galons

440 TIMES 20 = 8800 miles at todays prices before it starts to pay for itself, thats not bad

octobergirl;5920510

conversion was £1,000 but I love my car I was going to change it as it … conversion was £1,000 but I love my car I was going to change it as it was so expensive to run - its a Honda Shuttle 7 Seater and in amazing condition with low mileage - not an import, so I will be happy for the next 10 years with it and although it cost £1,000 it fels like it was worth the investment as I dont feel so bad driving it now it costs less

Hmm I hope that works out.

Seems a bit pricey though would be interesting to see if your road tax went down at all?

Road tax usually goes down by £15, I had mine converted last july, wrote a small blog about it lpgdreams.blogspot.com/

i find a better measure of consumption rather than miles per gallon, is pence per mile. My car went from 18p per mile to 9p per mile. Then its a lot easier to work out how much you're saving!