lpg mpg?

[donella]

hi, hope someone can help, ive just bought a second hand duel fuel daihatsu hijet, i filled up the gas tank which cost me �15.88 (at 54p pl)
today i drove about 110 miles and the gas ran out just before i got where i was going, on the return journey i switched to petrol and used about �15 worth, so basically the running cost for lpg and petrol (per mile) are the same,
is this normal?

[ChuckFickens]

http://www.centralgaragecarcroft.co.uk/faq.htm

about 3/4's of the way down it says

How many miles per gallon (mpg) can I expect running on LPG?
There is a small reduction in the mpg for most vehicles. For example, a vehicle with Multi Point Gas Injection doing 30 mpg on petrol would be expected to achieve approximately 27-28 mpg on LPG, however the current fuel price for LPG is about 50% of the price of petrol.


So sounds like something is not right

[donella]

thanks chuckfickens, i thought is it was a bit odd, i also seem to have more power when running on gas and all the info i can find seems to say the opposite so ill get it checked out, hopefully the garage near where i buy the gas can help!

[donella]

update!!
when i went to fill up with gas it only took �10!! apparently the gauges for the gas are pretty unreliable
so i had about �6 worth left, seems its not using as much as i first thought, now I've been driving it around a bit it seems to be costing (around town) roughly 9.5p per mile on gas and about 13p per mile on petrol, so I'm pretty pleased with that!!