IIRC, plugs are 1 heat range up as well. 5 (fuel) vs 6 (gas)
Numerically up for NGK only, actually lower by number for Bosch, 7 in that range instead of 8 or 9 for petrol. They're both "fuels" BTW as in "dual fuel".
Working on Bee uteys figures of using 20 -25% more. then $0.76 becomes $0.91 -$0.95 and then there is slight loss of power, i found this noticeable especially when towing..
Later model systems allow programming of partial petrol operation under full load allowing a slight increase in full load power over straight petrol. A very handy feature for keeping valves and injectors healthy in hard working engines.
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