[Charles Martel]

Around a thousand + or - a few hundred is more in line with what I would expect a conversion to cost.

IIRC, these conversions ran $1,800 - $2,000 back in the late 1970s when Popular Mechanics and Hot Rod magazines did articles on them (as alternatives to the poor-quality gasoline). I think they even did charts showing how long the fuel cost savings would take to "pay for" the conversion work.

[thackney]

IIRC, these conversions ran $1,800 - $2,000 back in the late 1970s when Popular Mechanics and Hot Rod magazines did articles on them

I believe you are talking about LPG (propane) conversions, not Natural Gas (methane).