Do not ever lpg, it will cause valve regression and blow the headgasket be there got 2 t shirts.
You will get no more than 23 mpg but the cost is just over half so returning 40 ish mpg
Insurance will got up and you will need annual service for valid insurnace and no trips on the euro tunnel. Lpd band
Keep supra and buy an electric for work.
Just brought an ampera had it 4 months and haven't brought and petrol yet.
My fuel bill for a diesel doing 50mpg at£150 a month to £22 on electricity with no tax. Saving paid for the car.
More money to spend on the weekend car. Just don't tell the the wife.
Just buy a second car and keep the miles down.