propane system
Junior User
Joined: Jan 2008
Posts: 81
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You will get on average about 3mpg less then if you were running gasoline. Propane has a lower BTU and because of that your mpg drops by about 10-20% when you do the switchover. It depends on a lot of things like compression, type of engine, type of propane injection system, etc.
The advantage is that propane in most places is cheaper; however it needs to be 10-20% cheaper to just break even. I have thought about it as well, the cost is prohibitive for me at the moment. Other disadvantages are that even with hardened valve seats it will wear out your seats a lot faster. So figure an engine rebuild every 100,000 miles or so. However in the interim you will be doing fewer oil changes.
The advantage is that propane in most places is cheaper; however it needs to be 10-20% cheaper to just break even. I have thought about it as well, the cost is prohibitive for me at the moment. Other disadvantages are that even with hardened valve seats it will wear out your seats a lot faster. So figure an engine rebuild every 100,000 miles or so. However in the interim you will be doing fewer oil changes.
Postmaster
Joined: Aug 2000
Posts: 3,312
Likes: 1
From: Eldorado Ca. USA
I have heard that propane motors had twice the life expectancy of the same engine running on gasoline? I have also heard that the fuel economy will be same or slightly less on flat ground, but will really decrease in the hills. Propane is getting stupid expensive now, I would rather run gasoline. I used to want a diesel rig but now with the cost of that fuel staying outrageous, I dont want one now either. 
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