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A big paper filter. Unless it's a throw away engine.
If you can run the AFR where ever you want it run it lean at part throttle. I was getting 12 to 13 mpg in my 7.4L, 3-speed, 4.11 rear end aero dynamics worse than a jeep which is hard to do, in the city I never took it on a real road trip but when I did take it on a 50 mile round trip to the next town over I would get between 16 and 18mpg with lean burn.
I was getting around 8mpg in town and about 12 on the highway with a properly tuned carb.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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