Quote:
Originally Posted by Alan Roehrich
The TBI engine is no better than the carbureted engine for fuel efficiency or performance, and in fact is often worse. The TBI engine is in fact the exact same engine as the old carbureted engine, except that in most cases it has an adapter and a 650 cfm fuel injection throttle body instead of a 750 cfm Q-Jet.
The Vortec engines are light years ahead.
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At some point physics come in to play. When you are powering a boxcar hooked to another boxcar that is very heavy, it just takes fuel to move it! We have had all types of tow vehicles. Our gasser with 454 with 4LE80 was 6-8 Mpg. Our current diesel pusher 8.3 cummins is generally 7.5mpg . We pull a 24 ft trailer. The difference for us was that the diesel pusher is quieter, more stable and it stops waaaay better than the gasser. I doubt if you will save a lot on fuel with a TBI.