LPG Consumption Subaru Legacy 2.0R?

Can anyone report on concrete experience values? The data I found in the nett vary greatly. Generally speaking, a 20-30% higher gas consumption compared to petrol is assumed. I tried to calculate this once and to set it in relation to the consumption of my S60 with 6l diesel at 100 km: consumption S60 2.4D (to 100km) outside (80% AB): 6l diesel x 1.12Eur=6.72EUR ———————————————————————————————— on 30% extra consumption with LPG and a conservative estimated price for LPG of 0.65 EUR I come at the following cost resp. saving: Consumption Legacy 2.0R Combi (to 100km) within: 12,4l +30%=16,1l LPG x 0.65=10,47EUR apart: 7.0l +30%=9.1l LPG x 0.65= 5,91EUR combined: 9.0l +30%=11.7l LPG x 0.65= 7,60EUR saving with Legacy LPG at 30000km/year (consumption outside): 243,-EUR ——————————————————————————— 0% More consumption with LPG results in the following costs or savings: Consumption Legacy 2.0R Combi (to 100km) within: 12.4l +20%=14.9l LPG x 0.65=9.67EUR extra-urban: 7.0l +20%=8.4l LPG x 0.65= 5.46EUR combined: 9.0l +20%=10.8l LPG x 0.65= 7.02EUR Saving with Legacy LPG at 30000km/year (extra-urban consumption): 378,-EUR Add to this approx. 235,-EUR less vehicle tax compared to diesel. With optimal driving out of town I get a saving in terms of consumption and tax pr. o Year, which should be between 478,- and 613,- EUR. Is that realistic, or do I have a mistake in there somewhere? And if we are already there, how much gas goes into the tank at the Legacy? I found information about the range with gas of about 400 km. That’s not much. For me this would mean having to refuel at least 2 times the week. With my diesel I come with a filling of 1000 km. For reviews, tips and hints I would be very grateful. s (who thinks very seriously about a legacy)