I thought NG had more calories per lb? Does that $6K include maximizing the internals of the engine itself as well as the plumbing up top?
So all things considered if I am currently getting 20mpg at a fixed cost with gas that is 3x the price switching over would be the same as getting a vehicle that is getting 60mpg and my yearly expenses go down by 2/3? From that I would be able to determine the breakeven point and predict how much I would eventually save over the years. (assuming a set inflation standard)Mileage is the same. It's cost that is different. CNG is 47.9 per litre (70 cents per Kg) equivalent in SK
With propane you should be jacking the compression up to about 10.5 to 1 if you want the best performance and the cleanest burning engine. Modern fuel injection would need to be running on aviation fuel to run at that ratio. If that is the case a dual fuel (at the same time) engine could be hatched, high compression with regular gas and NG injection that is activated by the knock sensor. You might not get right to 10.5 but even 10 would be a gig improvement over the current 8.5.Internals stay the same but the ECU is replaced to advance the ignition.