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It may sound backwards but put some kind of tunable fuel induction system on that motor. Even if it's a carb.
Tune it for lean burn.
I did this on 2 carbureted and it boosts fuel economy by about 20%.
Cross fire is kind of all around hated. Low horsepower, laggy throttle response and lack luster fuel economy.
A manual transmission is the way to go. My 1989 firebird has a 350 TPI, 6-speed with 0.6:1 top gear and 3.73 gears and it gets at least 26mpg if I can keep my foot out of it.
I am going to put a T-56 magnum in it with 3:1 first gear and 0.5:1 top gear and a ford 9 inch with a 3:1 or 3.25:1 gears. That should boost the fuel economy up a little.
Then the 350 might not have the torque to turn the wheels going down the highway at 1300rpm so u have a high compression 489 cubic inch engine to put in it.
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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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