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Gas turbines have a very narrow high effeciency margin.
Usually you want the piston engine at its most efficient speed and load while the turbo is usually running at 10% or 20% efficiency.
You could size both the pistion and turbine engine to be most efficient at cruising speed but that would be all the vehicle would be good for. Every other driving condition would be less drivable. You would have to have a tiny engine turning about 2500rpms with a properly sized turbo boosting it to between 10 and 30 psi.
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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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