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For 2K you did well. The battery warranty claim is close to 3 grand alone. I would get the battery work done, which might also kill the check engine light. After that if the check engine light is still on then figure out what you need to do to get it fixed.
With the battery pack working, you can accelerate at about 3k RPM and get good mileage. If there are slight grades where you live, get a feel for the tactic of very slight acceleration on gradual uphill grades then coasting (in gear) on the downgrade with very slight deceleration. I am talking like 30 seconds to gain or lose 5 MPH.
I found that using this tactic I could get 80-90 MPG when everything was warm.
Don't even think about a 5 speed conversion. The number of parts you would have to replace is astronomical. If I could manage 68 MPG average in mine then you should be able to come close to that.
You may need to clean the EGR passageways which is not a very difficult job.
regards
Mech
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