Hi Bob - welcome to the forum. So maybe a Spirit wouldn't have been the #1 choice for economy, but the 5-speed is its saving grace. Gives you options in driving that the automatic just doesn't.
After basic maintenance, I'd go for:
1) fuel economy instrumentation - you'll need to build / buy an MPGuino since your car is older than 1996
2) block heater
3) partial grille block
What type of driving do you do most? The next tips would depend on the answer.
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