ON my 1988 5.8lt F250 will I save money on fuel if I get the motor converted to run on LPG (Liquid petrolium gas) ?
I currently get about 14mpg on petrol. Petrol cost $3.50 per gal.
I dont know what I would get on LPG but LPG only cost $1.50 per gal around here.
Alot of Cabs and emergency trucks have been converted to LPG but I dont know what mpg they are getting?

 

LPG? same as propane?

I ran a 79 F-250 460 cid on propane for a few years. Propane has a slightly lower amount of energy in it due to being less dense than gasoline. Therefore you will receive a slightly lower mpg. The good news is it's only a little lower. At the prices you quote it'd probably be a screamin' deal.

3.50 for "petrol"? Can I assume you don't live in the U.S.? Around here(State of Kansas) Propane is a popular modification with the farmers because they can buy it without paying the road tax. However if you do that and then run it in a vehicle you could get slapped with some massive fines and/or legal charges. If you pay the road tax like you're supposed to, it'll cost 10 to 20 cents less than gas but the mpg difference makes it just about even.

Three interesting things, First, the standard bed mounted tank holds approx. 80 gals. My truck has two 20 gal gasoline tanks. As my setup allowed me to switch back and forth from gas to propane, I could go almost anywhere without stopping for fuel.

Second, propane has a 105 octane rating! Just think how much compression you could run. How bout' BOOST! I really want a 300 cid twin turbo on propane, just to screw with people.

Third, if you get the chance pull the dipstick on a propane motor and examine the oil. It burns so clean that the oil will break down and get thin and runny before it will get dirty. Cylinders show very little wear as they don't have gas scrubbing the oil off. The motors are beautifully clean after years of service.

Well I think I'm done extolling the virtues of propane.
Startin' to sound like a propane salesman.
Hope this helps you out.

 

You want more info e-mail me jengland@gasequipment.com been doing it for 20 years.

Gasman
Propane:Smells Funny Burns Great

 

 

i have been considering doing the conversion too, mostly because its easily 50 cents cheaper per gallon than gas, but would the gas mileage difference(i've been told about 10% less) make it not worth the time? especially at 10-12mpg on gas?