Out of the box they are as piggy as everyone says they are. I know others who have more cash to spend on ECMs and tuners that will run circles around me and get better mileage doing it. My point is that these are excellent engines when a few cheap and easy mods are made. I changed the fuel filter head and filter, mufflers, upped the fuel pressure, had the rack run by someone who knows how to put a bit of timing back into it with the settings and had a 550 brakesaver program that gave me a couple more degrees of timing back and with good numbers installed. Pulling a flat or step it will get almost a mile per gallon more. If I slowed down to 60 I'd get nearly 6 and with some areo mods even more. It now runs very strong and gets 5.5 to 5.6MPG average running 64MPH pulling a 53 van. It started out as a weak, fuel guzzling pig. Going 30,000 was a bit too long according to the sampling. It uses 1 gallon of oil between 25,000 mile oil change intervals. lookes like a late 80s erly 90s model just from looking at it but im not a cat guy if you got the vin call milton cat up they should be able to tell you i would think they probably sold it. I took lots of advice from lots of smarter than me guys in threads in this forum.
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