80 - 90 mpg on LPG ? Really ?
Discussion
cologne2792 said:
That'll be someone estimating the "cost equivalent" so is probably about right. My 2.4 accord runs at around 26mpg on gas, but costs 14ppm. Thats very similar cost per mile as my 50mpg TDi was getting previously. So you could say my accord runs 50mpg as a cost equivalent to my old TDiNot a chance.
You lose between 10 and 20% of your petrol MPG when running on LPG (assuming the car is tuned to deliver the same amount of power on LPG as on petrol).
No way on god's earth does that engine return over 50mpg on petrol which is what you'd need to be getting to have 80-90 mpg on LPG especially given the recent drops in the price of petrol. Obviously that's dependant on just how cheaply you can buy your LPG, but unless you've got a properly cheap source like a local countrywide depot 65-70p a litre is usually about right - at least in this neck of the woods.
You lose between 10 and 20% of your petrol MPG when running on LPG (assuming the car is tuned to deliver the same amount of power on LPG as on petrol).
No way on god's earth does that engine return over 50mpg on petrol which is what you'd need to be getting to have 80-90 mpg on LPG especially given the recent drops in the price of petrol. Obviously that's dependant on just how cheaply you can buy your LPG, but unless you've got a properly cheap source like a local countrywide depot 65-70p a litre is usually about right - at least in this neck of the woods.
sparkyhx said:
may be possible on a motorway run. Not sure what Petrol mpg is possible in that car, but take 10% off and double it.
My Lexus LS430 used to do about 55mpg on a run and about 25-30 round town (v8 4.3litre) better than any equivalent sized car on diesel.
55MPG from an LS430?My Lexus LS430 used to do about 55mpg on a run and about 25-30 round town (v8 4.3litre) better than any equivalent sized car on diesel.
'Cost equivalent' is the important phrase with LPG.
You will usually get less on a gallon of LPG, but factor in that LPG is around 1/2 the price you multiply the actual figure by 2.
Setting up an engine to run exclusively on LPG will improve the figure but without some electrickery it will be so far advanced it may not even run on petrol.
I've run a 3.5EFi RRC on LPG for over 14 years. Costwise I get the same miles/£ as if it was fitted with a diesel engine.
You will usually get less on a gallon of LPG, but factor in that LPG is around 1/2 the price you multiply the actual figure by 2.
Setting up an engine to run exclusively on LPG will improve the figure but without some electrickery it will be so far advanced it may not even run on petrol.
I've run a 3.5EFi RRC on LPG for over 14 years. Costwise I get the same miles/£ as if it was fitted with a diesel engine.
I had a diesel Berlingo for work and bike transport duties, it was slow and economical, and did 700 miles to a tank.
I replaced it with an LPG Berlingo, it was slow and no more economical, and the throttle response was dire, and it needed filling up every 230 miles, and I had a spare wheel in the back.
I had the diesel for seven years, I had the LPG for one. Never again.
I replaced it with an LPG Berlingo, it was slow and no more economical, and the throttle response was dire, and it needed filling up every 230 miles, and I had a spare wheel in the back.
I had the diesel for seven years, I had the LPG for one. Never again.
sparkyhx said:
may be possible on a motorway run. Not sure what Petrol mpg is possible in that car, but take 10% off and double it.
My Lexus LS430 used to do about 55mpg on a run and about 25-30 round town (v8 4.3litre) better than any equivalent sized car on diesel.
No, it didn't do 55mpg on a run or get 25-30 around town. It got 30mpg on a run and 12-15 around town. You're roughly doubling up the figures as an equivalent. And that is the key point - you should be quoting "equivalent" MPG, not that it was an absolute figure.My Lexus LS430 used to do about 55mpg on a run and about 25-30 round town (v8 4.3litre) better than any equivalent sized car on diesel.
An equivalent sized vehicle, like the BMW 730d will get around the same figures, but instead of being an equivalent, it'll be an actual figure.
SpeckledJim said:
LPG isn't really suited as an alternative to a 4-cylinder derv misery-box.
It's much better used to make large petrol engines realistic for daily use.
It's much better used to make large petrol engines realistic for daily use.
It's not something you do to make the cheapest possible car to run (in the UK, at least); it's something you do to make a desirable car vaguely affordable. Thus the car above is somewhat pointless. SpeckledJim said:
LPG isn't really suited as an alternative to a 4-cylinder derv misery-box.
It's much better used to make large petrol engines realistic for daily use.
I can't see the appeal of LPG there either, unless you had a massive tank. I'd rather buy a vehicle that was suited to the job I want it to do, which the diesel van did. It's much better used to make large petrol engines realistic for daily use.
If you can't afford to run a big petrol car, surely the best thing is to not buy one?
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